If this lands on your feed, tell me about different features that are just missing in Matrix.
It can be anything, but please don't include memes like "unable to decrypt message" or other things that are already in the works, or maybe has already been merged (e.g media captions). Also, no, I won't "just use XMPP".
Some examples include better forwarded messages, rich profiles, or a live location sharing, just to name a few.
(I am writing something about this, boosts appreciated!)
@gim there's been a lot of work on Read Markers (or rather making them more reliable) since Element started work on Element X on Android and iOS
Whilst on Android there's currently a longstanding bug that makes sync take longer than expected, once sync goes through and gets started, the read markers are VERY reliable now, even upon restarting the app.
I would assume those improvements will come to Desktop/Web once they're fully ready :)
@gim That is probably less of an issue with the app and more of an issue with the fact that it uses an experimental way of syncing which has not quite made it into stable yet, as such instead of it being directly in the server, it gets handled by a separate proxy program.
The Matrix Foundation and Element are currently in the process of simplifying Sliding-Sync (turns out the "sliding" bit doesn't work well with encryption) at which point it will go directly into stable versions of Synapse, the most popular Matrix Homeserver Software.
TL;DR: If you're not self-hosting the Sliding-Sync bit, chances are it just hung up. No worries on your end.
Alexia 
gim