OMEMO is a mixed bag. Some clients are still preferring older versions that aren’t the best for security & almost every client does a bad job explaining that new keys are being used need to be verified… Gajim only recently gave a decent in-client pop-up for it, but it’s doesn’t work all the time. That said, this is basically the same issue Matrix has in the space. Both are based on libsignal if not outright using it, except Signal gets a point of privilege in basically having just one client …one that must be on Android/iOS according to their statements… so they can do a ‘better’ job managing who, what, & how many keys are being used. Many XMPP clients will recommend blind trust by default just because it can be a real hassle to deal with multiple clients & users coming back to less-often-used devices. There have been proposals to fix it, but I haven’t seen anything really take off (meanwhile considering just using the PGP encryption option as less flaky).