Check your other replies. This isn’t difficult.
Someone has already responded to you with direct deep links to the settings you wanted.
Sync has been around for a long time and has loads of customisations. If only you’d bothered to go through the settings before giving up, you’d have been able to make Sync your own.
Have you actually tried Sync? It has significantly better UX than the alternatives currently, and the feature list is unparalleled (I’ve really missed being able to filter out specific users or communities from my feeds).
The Google implementation of rcs is E2EE.
What do you mean? Last year, I effectively had to stop using it because Google was testing a new blocking method in the UK - this resulted in constant buffering.
A recent update has resolved this issue, and the app is back to being the best version of YouTube available.
Use revanced on Android
I wish this Sync had the “sort communities list by times visited” option like Sync for Reddit