Re: metadata: I really like Riot/Matrix and have convinced a bunch of formerly non-IRC people to start using IRC through Matrix (the great free IRC bouncer in the sky!). However, a couple of things that bother me:

- The fact that it appears to be impossible to disable typing notifications ("X is typing...") and read receipts. This can change the nature of a conversation and really should be optional. Coming from IRC, it just feels plain creepy. A friend flat-out refused to use Riot because of this.

- The fact that device information is leaked to everyone who happens to be in the same channel. So I can join #matrix and click on any of the >5k users and see information about all the devices a particular user has used. Here's from one random person: "https://riot.im/app/ via Chrome on Mac OS", "https://riot.im/app/ via Chrome on Windows", E5823 (ah, J. Doe is using a Sony Xperia Z5 Compact!), etc. Sometimes things like "Joe's iPhone" is exposed -- and I don't think Joe had any idea of that. This is bad.