[OnePlus 3 Themes, Apps, and Mods] Deleted member 11396015:
Based on LOS 17.1 / 18.1 as most of the ROM's are based on it.

# AntHalService F.e. fitness apps are using some radios supplied by AntHalService
# AudioFX Equalizer for customizing audio parameters
# Backgrounds Used for backgrounds though without still possible to set
# BackupRestoreConfirmation User confirmation dialog for adb backup
# BasicDreams Interactive screensaver mode
# BluetoothMidiService Sending and receiving using MIDI protocol over Bluetooth & USB
# BookmarkProvider Centralized bookmark holder using different browsers
# BuiltInPrintService Print service for printers supporting IPP Internet Printing
# CallLogBackup Backup feature for call history and sms
# CaptivePortalLogin Used for the login popup for private network access verification
# CarrierConfig Carriers can automatically update their Access Point Name (APN) information
# CarrierDefaultApp Data management functionality for example to disable data on reaching limit
# CellBroadcastReceiver Service for emergency channels and provider priority messages
# CertInstaller Used For installing network certificates
# CneApp Vendor app for CNEService
# CNEService Qualcomm service choosing best Wifi or Mobile connection automatically
# com.qualcomm.location Please read https://www.qualcomm.com/site/privacy/services
# CompanionDeviceManager System Level Service for using smartwatches etc..
# CtsShimPrebuilt Compatibility Test Suite to ensure hardware will be compatible with Android
# CtsShimPrivPrebuilt Compatibility Test Suite to ensure hardware will be compatible with Android
# datastatusnotification allows to cap data when you've reached the limit of your plan
# DocumentsUI Default file manager
# DownloadProviderUi User interface For download manager
# dpmserviceapp Public interface for managing policies enforced on a device
# DynamicSystemInstallationService Used on A/B devices for Google or OEM signed dynamic system updates
# EasterEgg The famous easter egg
# Eleven Default Lineage music player
# Email Default email app
# embms LTE Evolved Multimedia Broadcast Multicast Service for network offload
# EmergencyInfo Emergency information used for home screen emergency contacts
# Exchange2 Exchange support for email app
# ExtShared Notification service related, sorting messages on importance (crash on removal)
# Gallery2 Default gallery app
# HTMLViewer Default viewer for reading HTML files on your device
# IFAAService WeChat - Alipay related biometric authentication used for payment
# ims Used for VolTE and Wifi-calling, not needed for normal calling
# imssettings Used for VolTE and Wifi-calling, not needed for normal calling
# InputDevices Support for alternative input devices like trackballs, mice and styluses
# IWlanService Interworking LAN, carrier using WiFi for cellular data offload
# Jelly Default Lineage internet browser
# LineageSetupWizard Lineage Initial setup wizard
# LineageThemesStub Not sure about its functionality as Lineage Themes are in ThemesPicker
# LiveWallpapersPicker Service for using live wallpapers as background
# LocalTransport Locally backup storage support used for development and debugging
# ManagedProvisioning Setup wizard for managed profiles mostly used for company usage
# NQNfcNci NFC is used for contactless tap and pay paying by phone
# OneplusDoze app for pickup sensor handling
# OneplusPocketMode app for pocket mode
# OneTimeInitializer Default Initial setup wizard of Android on first time boot
# ONS Something related to network, not sure about functionality
# PhotoTable Daydream photo table functionality
# PowerOffAlarm Alarm function van wake up device
# PrintRecommendationService Provides classes for plug-in print service components
# Profiles Work profiles to manage data and apps for company usage
# ProxyHandler Handling proxy configs and integration with apps
# qcrilmsgtunnel Qualcomm related, seems to have bad effects on fast dormancy drain
# Seedvault Open Source Backup provider
# SharedStorageBackup Shared backup storage support
# SimAppDialog Used to install the carrier app when SIM is inserted
# Snap Default Lineage camera app
# SoterService WeChat - Alipay related biometric authentication used for payment
# StatementService Check API for apk used in package manager
# Stk Sim Application Toolkit for interaction with SIM for value added services
# StorageManager Smart managing and cleanup of storage
# Tag NFC Tag handling
# Terminal Terminal which normally can be enabled in developer settings
# Traceur Tool that captures raw trace data used for developer purposes
# uceShimService Google RCSService RCS (Rich Communication Service) related
# Updater ROM update check and installer
# UserDictionaryProvider User dictionary for AOSP keyboard
# VpnDialogs User setup dialog used for VPN tunnel setup
# WallpaperBackup Used for saving and keeping a backup of wallpapers
# WallpaperCropper Used for cropping images for wallpaper purpose
# WAPPushManager Used for the Google WAP push messages
# WfdService WiFi Direct Service for direct communication between WiFi devices

The extreme script is based on LOS 17.1, the other script is the one I am using on LOS 18.1 at the moment where only the minimum is removed.

No support on the scripts, though:

- unzip

- remove the txt extension from the file in the zip so it will be a bash file

- you can now move it to your sd card

- in twrp terminal do a chmod 755 setup.sh

- ...... and run it.

First check and understand before you are doing actually anything!!

Setup-extreme.sh was delaying messages sometimes, probably because of deep sleep and not keeping it's data connection up.

Never tried to solve this but you probably can by only removing some lines from the additional build.prop lines.