[Xiaomi Mi CC9 / Mi 9 Lite Guides, News, & Discussi] Avraham Tsaban:
Summary

Safe to remove

pm uninstall -k --user 0 cn.wps.xiaomi.abroad.lite

pm uninstall -k --user 0 com.android.browser

pm uninstall -k --user 0 com.android.calendar

pm uninstall -k --user 0 com.android.chrome

pm uninstall -k --user 0 com.android.egg

pm uninstall -k --user 0 com.android.htmlviewer

pm uninstall -k --user 0 com.android.mms

pm uninstall -k --user 0 com.android.providers.partnerbookmarks

pm uninstall -k --user 0 com.android.soundrecorder

pm uninstall -k --user 0 com.duokan.phone.remotecontroller

pm uninstall -k --user 0 com.facebook.appmanager

pm uninstall -k --user 0 com.facebook.katana

pm uninstall -k --user 0 com.facebook.services

pm uninstall -k --user 0 com.facebook.system

pm uninstall -k --user 0 com.google.android.apps.docs

pm uninstall -k --user 0 com.google.android.apps.maps

pm uninstall -k --user 0 com.google.android.apps.photos

pm uninstall -k --user 0 com.google.android.apps.tachyon

pm uninstall -k --user 0 com.google.android.calendar

pm uninstall -k --user 0 com.google.android.gm

pm uninstall -k --user 0 com.google.android.googlequicksearchbox

pm uninstall -k --user 0 com.google.android.inputmethod.pinyin

pm uninstall -k --user 0 com.google.android.music

pm uninstall -k --user 0 com.google.android.marvin.talkback

pm uninstall -k --user 0 com.google.android.videos

pm uninstall -k --user 0 com.google.android.youtube

pm uninstall -k --user 0 com.huawei.hwvplayer

pm uninstall -k --user 0 com.instagram.android

pm uninstall -k --user 0 com.mi.android.globalminusscreen

pm uninstall -k --user 0 com.mi.android.globalpersonalassistant

pm uninstall -k --user 0 com.micredit.in

pm uninstall -k --user 0 com.milink.service

pm uninstall -k --user 0 com.mipay.wallet.id

pm uninstall -k --user 0 com.mipay.wallet.in

pm uninstall -k --user 0 com.miui.analytics

pm uninstall -k --user 0 com.miui.android.fashiongallery

pm uninstall -k --user 0 com.miui.backup

pm uninstall -k --user 0 com.miui.cleanmaster

pm uninstall -k --user 0 com.miui.cloudbackup

pm uninstall -k --user 0 com.miui.cloudservice

pm uninstall -k --user 0 com.miui.cloudservice.sysbase

pm uninstall -k --user 0 com.miui.enbbs

pm uninstall -k --user 0 com.miui.freeform

pm uninstall -k --user 0 com.miui.hybrid

pm uninstall -k --user 0 com.miui.hybrid.accessory

pm uninstall -k --user 0 com.miui.micloudsync

pm uninstall -k --user 0 com.miui.mishare.connectivity

pm uninstall -k --user 0 com.miui.msa.global

pm uninstall -k --user 0 com.miui.notes

pm uninstall -k --user 0 com.miui.player

pm uninstall -k --user 0 com.miui.screenrecorder

pm uninstall -k --user 0 com.miui.touchassistant

pm uninstall -k --user 0 com.miui.translation.kingsoft

pm uninstall -k --user 0 com.miui.translation.xmcloud

pm uninstall -k --user 0 com.miui.translation.youdao

pm uninstall -k --user 0 com.miui.translationservice

pm uninstall -k --user 0 com.miui.userguide

pm uninstall -k --user 0 com.miui.videoplayer

pm uninstall -k --user 0 com.miui.vsimcore

pm uninstall -k --user 0 com.miui.weather2

pm uninstall -k --user 0 com.miui.yellowpage

pm uninstall -k --user 0 com.netflix.mediaclient

pm uninstall -k --user 0 com.netflix.partner.activation

pm uninstall -k --user 0 com.xiaomi.bluetooth

pm uninstall -k --user 0 com.xiaomi.bluetooth.overlay

pm uninstall -k --user 0 com.xiaomi.bttester

pm uninstall -k --user 0 com.xiaomi.glgm

pm uninstall -k --user 0 com.xiaomi.joyose

pm uninstall -k --user 0 com.xiaomi.mi_connect_service

pm uninstall -k --user 0 com.xiaomi.midrop

pm uninstall -k --user 0 com.xiaomi.mipicks

pm uninstall -k --user 0 com.xiaomi.miplay_client

pm uninstall -k --user 0 com.xiaomi.mirecycle

pm uninstall -k --user 0 com.xiaomi.payment

pm uninstall -k --user 0 com.xiaomi.scanner

pm uninstall -k --user 0 com.xiaomi.xmsf

Safe to remove, but hard to find alternatives/may cause minor issues:

pm uninstall -k --user 0 com.mi.android.globalFileexplorer

pm uninstall -k --user 0 com.miui.audiomonitor

pm uninstall -k --user 0 com.miui.bugreport

pm uninstall -k --user 0 com.miui.calculator

pm uninstall -k --user 0 com.miui.compass

pm uninstall -k --user 0 com.miui.fm

pm uninstall -k --user 0 com.miui.fmservice

pm uninstall -k --user 0 com.miui.gallery

pm uninstall -k --user 0 com.miui.miservice

pm uninstall -k --user 0 com.miui.misound

pm uninstall -k --user 0 com.tencent.soter.soterserver

pm uninstall -k --user 0 com.xiaomi.account

pm uninstall -k --user 0 com.xiaomi.discover

pm uninstall -k --user 0 com.xiaomi.micloud.sdk

pm uninstall -k --user 0 com.xiaomi.simactivate.service

Open for experiments:

pm uninstall -k --user 0 android.autoinstalls.config.Xiaomi.pyxis

pm uninstall -k --user 0 com.android.bookmarkprovider

pm uninstall -k --user 0 com.android.dreams.basic

pm uninstall -k --user 0 com.android.emergency

pm uninstall -k --user 0 com.android.wallpaper.livepicker

pm uninstall -k --user 0 com.android.wallpaperbackup

pm uninstall -k --user 0 com.lbe.security.miui

pm uninstall -k --user 0 com.mi.globallayout

pm uninstall -k --user 0 com.mi.webkit.core

pm uninstall -k --user 0 com.miui.aod

pm uninstall -k --user 0 com.miui.audioeffect

pm uninstall -k --user 0 com.miui.cit

pm uninstall -k --user 0 com.miui.core

pm uninstall -k --user 0 com.miui.daemon

pm uninstall -k --user 0 com.miui.extraphoto

pm uninstall -k --user 0 com.miui.face

pm uninstall -k --user 0 com.miui.global.packageinstaller

pm uninstall -k --user 0 com.miui.guardprovider

pm uninstall -k --user 0 com.miui.powerkeeper

pm uninstall -k --user 0 com.miui.qr

pm uninstall -k --user 0 com.miui.rom

pm uninstall -k --user 0 com.miui.sysopt

pm uninstall -k --user 0 com.miui.system

pm uninstall -k --user 0 com.miui.systemui.carriers.overlay

pm uninstall -k --user 0 com.miui.systemui.devices.overlay

pm uninstall -k --user 0 com.miui.systemui.overlay.devices.android

pm uninstall -k --user 0 com.miui.wmsvc

pm uninstall -k --user 0 com.wapi.wapicertmanage

pm uninstall -k --user 0 com.xiaomi.cameratools

pm uninstall -k --user 0 com.xiaomi.location.fused

pm uninstall -k --user 0 com.xiaomi.mbnloader

pm uninstall -k --user 0 com.xiaomi.misettings

pm uninstall -k --user 0 com.xiaomi.powerchecker

pm uninstall -k --user 0 com.xiaomi.providers.appindex

pm uninstall -k --user 0 com.xiaomi.upnp

pm uninstall -k --user 0 org.codeaurora.gps.gpslogsave

should not be removed or at least they broke something

com.android.providers.calendar

com.android.thememanager

com.miui.home

com.miui.miwallpaper

com.miui.notification

⚠ Do not remove ⚠

com.xiaomi.finddevice

com.miui.securityadd

com.miui.securitycenter

com.miui.securitycore

com.xiaomi.market

Detailed sheet, mostly based on your previous work, including descriptions: here. You may even recognize your own words.

Enjoy!