So, I briefly tried out Matrix some four years ago and left because it was utter trash and from what I gather from your comment it is still pretty much trash now. But despite there not being a single usable client, people still try to convince everyone that Matrix, by some obscrure metric, is superior to all other chat programs.
Sorry to say, but a chat protocol on its own is a tech demo at best and as long as there isn't a single feature complete and usable client, it's an alternative for no one except hardcore tech enthusiasts.
When I last used Matrix/Elements I had to deal with "lost keys" issues multiple times in just two months. This issue is a dealbreaker if it happens just once in a year and apparently, it's still a semi regular problem for some of my friends.
Just accept it, Matrix will never be a replacement for Discord, WhatsApp, Telegram or even just Microsoft Teams.
The first ever gangbang where everyone is just fucking themselves...