Thank you very much for these links. I really like the ideas Matrix + Element, and I think they have the best shot of making something very usable. Hopefully this gets implemented one day and I can actually make the switch!
Edit: While clicking around I came across this: https://github.com/matrix-org/matrix-rust-sdk/issues/5397#issuecomment-3714128184
Does this mean it should be already implemented or am I reading it wrong?

A couple of years ago sure, all his recent stuff is sponsored slop.