Highlights include Sliding Sync (instant login/launch/sync), Native OIDC (industry-standard authentication), Native Group VoIP (end-to-end encrypted large-scale voice & video conferencing) and Faster Joins (lazy-loading room state when your server joins a room).
You can’t disable sending read indicators in Element last I checked, only receiving them. What kind of problems is Lemmy having?
You can check the beehaw writeup if they didn’t defederate already. They’ve been having too many issues with Lemmy, and it’s been a battle with the developers. On Element desktop you can disable sending read receipts, but not mobile which is stupid.
I found this if it’s what you mean, but all it mentions tech-wise is that Lemmy is slow to develop. This does make sense, is it what you’re referring to?