My main problem is that many new features seem to leak more and more data. Encryption support is always "will be added later". For example if you want to send a

My main problem is that many new features seem to leak more and more data. Encryption support is always "will be added later". For example if you want to send a sticker or any inline image you need to upload it to the server in plaintext. Topics and profiles are unencrypted even in "encrypted rooms". Matrix is a pain-text protocol with a couple of encrypted extensions on top. Even worse is that most clients will happily let you use these leaky features in encrypted rooms with no warnings. I love Matrix, it is actually my primary chat network. But the way these features are getting added makes me really disappointed. You don't make a secure protocol by stuffing as many features as you can then adding encryption later. You build a secure protocol by making sure that every feature added is secure from the start, otherwise it is rejected or needs to explicitly justify why it can't or shouldn't be made secure.