[detaro]

I use XMPP+OTR where possible, and it can be quite painful.

Support for multiple active endpoints isn't solved, at least for the clients I use, so I have to hope that whoever writes me picks the endpoint I'm actually at or I have to go through a bit of unencrypted back and forth to make them connect to the right one (I think XMPP actually has extensions for mechanisms that could solve this, syncing messages between endpoints, but I've never seen them implemented).

At least some mobile clients only maintain the OTR session while in foreground, leading to massive notification spam on the other end/delays while the session is recreated.

No encrypted offline messages. (Yes, I know, not possible while maintaining the full guarantees of OTR, but it adds complications to the workflow)

All these don't really make for great UX, and many people are not willing to put up with it.