[Redmi Note 9S / Note 9 Pro (Indian Model) Question] gerega:
I have played around for some time with that phone and with the installed apps. This is my debloating list. You can check every app with a search engine where you will find hints what the app was/is used for. I actually want a clean phone with at best no preinstalled apps at all. So pay attention. This list will remove a lot! I recommend the Simple Mobile Tools from Fdroid or PlayStore for the daily driver apps like clock, contacts, calendar etc. instead of the preinstalled and deactivated ones. www.simplemobiletools.com

Please pay attention what you do. Not responsible for a broken MIUI. Some say removing Xiaomi/MIUI gallery app will send the device into bootloop. I havent experienced this! So you probably could / should leave com.miui.gallery on your device, just to be sure.

My device has no root, no custom ROM, just the original MIUI.

August 1st: I have a new debloating list for MIUI 11.0.10 here. Some things have changed there.

pm uninstall -k --user 0 com.android.chrome
pm uninstall -k --user 0 com.android.providers.partnerbookmarks
pm uninstall -k --user 0 com.facebook.appmanager
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.maps
pm uninstall -k --user 0 com.google.android.apps.wellbeing
pm uninstall -k --user 0 com.google.android.gm
pm uninstall -k --user 0 com.google.android.projection.gearhead
pm uninstall -k --user 0 com.google.android.youtube
pm uninstall -k --user 0 com.google.ar.lens
pm uninstall -k --user 0 com.miui.android.fashiongallery
pm uninstall -k --user 0 com.miui.cloudbackup
pm uninstall -k --user 0 com.miui.gallery
pm uninstall -k --user 0 com.miui.miservice
pm uninstall -k --user 0 com.miui.msa.global
pm uninstall -k --user 0 com.miui.yellowpage
pm uninstall -k --user 0 com.netflix.partner.activation
pm uninstall -k --user 0 com.xiaomi.glgm
pm uninstall -k --user 0 com.xiaomi.midrop
pm uninstall -k --user 0 com.xiaomi.mipicks

pm disable-user --user 0 com.android.calllogbackup

pm disable-user --user 0 com.android.egg
pm disable-user --user 0 com.android.fileexplorer
pm disable-user --user 0 com.android.hotwordenrollment.okgoogle
pm disable-user --user 0 com.android.hotwordenrollment.xgoogle
pm disable-user --user 0 com.android.providers.downloads.ui
pm disable-user --user 0 com.android.soundrecorder
pm disable-user --user 0 com.google.android.apps.googleassistant
pm disable-user --user 0 com.google.android.apps.messaging
pm disable-user --user 0 com.google.android.apps.subscriptions.red
pm disable-user --user 0 com.google.android.apps.walletnfcrel
pm disable-user --user 0 com.google.android.calendar
pm disable-user --user 0 com.google.android.contacts
pm disable-user --user 0 com.google.android.feedback
pm disable-user --user 0 com.google.android.googlequicksearchbox
pm disable-user --user 0 com.google.android.marvin.talkback
pm disable-user --user 0 com.mi.android.globalFileexplorer #FileManager
pm disable-user --user 0 com.mi.global.shop
pm disable-user --user 0 com.miui.analytics
pm disable-user --user 0 com.miui.backup
pm disable-user --user 0 com.miui.bugreport
pm disable-user --user 0 com.miui.calculator
pm disable-user --user 0 com.miui.cleanmaster
pm disable-user --user 0 com.miui.cloudservice
pm disable-user --user 0 com.miui.cloudservice.sysbase
pm disable-user --user 0 com.miui.compass
pm disable-user --user 0 com.miui.fm
pm disable-user --user 0 com.miui.fmservice
pm disable-user --user 0 com.miui.huanji #MiMover
pm disable-user --user 0 com.miui.micloudsync
pm disable-user --user 0 com.miui.notes
pm disable-user --user 0 com.miui.player
pm disable-user --user 0 com.miui.screenrecorder
pm disable-user --user 0 com.miui.videoplayer
pm disable-user --user 0 com.miui.weather2
pm disable-user --user 0 com.tencent.soter.soterserver
pm disable-user --user 0 com.xiaomi.joyose
pm disable-user --user 0 com.xiaomi.miplay_client
pm disable-user --user 0 com.xiaomi.micloud.sdk
pm disable-user --user 0 com.xiaomi.payment
pm disable-user --user 0 com.xiaomi.scanner

pm disable-user --user 0 com.android.apps.tag
pm disable-user --user 0 com.android.backupconfirm
pm disable-user --user 0 com.android.bips
pm disable-user --user 0 com.android.bookmarkprovider
pm disable-user --user 0 com.android.dreams.basic
pm disable-user --user 0 com.android.dreams.phototable
pm disable-user --user 0 com.android.emergency
pm disable-user --user 0 com.android.managedprovisioning
pm disable-user --user 0 com.android.printspooler
pm disable-user --user 0 com.android.proxyhandler
pm disable-user --user 0 com.android.wallpaper.livepicker
pm disable-user --user 0 com.android.wallpaperbackup

pm disable-user --user 0 com.google.android.ext.shared
pm disable-user --user 0 com.google.android.onetimeinitializer
pm disable-user --user 0 com.google.android.partnersetup
pm disable-user --user 0 com.google.android.printservice.recommendation

pm disable-user --user 0 com.mi.health
pm disable-user --user 0 com.android.deskclock