Discord. My non-technical friends are there, even the technical servers seem more populated by knowledgeable people than Matrix. Matrix has been very confusing to use, and personally, except for the servers that bridge everywhere, I found it lacked the people I actually want to talk to. I prefer even IRC to Matrix.
Yes, give me buttons for /subscribed and whatever the other one is. Also, I miss the dopamine rush of that notification counter going up.