To me the main issue right now is history sharing in encrypted rooms being non functional. At the moment when you invite someone new to an encrypted room, they wont be able to read the historic messages in it, even if you toggled that on. They are working on it and its probably not super far away, but currently you basically have to use unencrypted rooms if you want new people to be able to see old messages.

github.com/element-hq/element-meta/issues/2829