Looks like Dino is enabling #OMEMO by default for the next release¹. I think that was the last of the major #XMPP clients to do so. Hopefully we can now put the "But XMPP is not encrypted by default" debate to rest.
¹: https://github.com/dino/dino/commit/fc6447c56e7fdaf6f6d843a2215d870caee4aba0