The one thing I would like to see fixed is better cross-device verification. Discord solves this in an elegant and painless way with QR codes. Element has users manually compare emoji or codes and perform steps. Anecdotal: my last experience was less than good. For some reason it tried to verify twice, but even after I verified both times, it was still showing device listings as unverified.

I don't know what went wrong, but it still needs work. I'm glad to see that it's easier than last time I tried that.