Too heavy and bloated, and too centralized in its design philosophy, not to mention big capital flowing through Matrix from Israel and the issues with metadata making it a privacy disaster.

Here's a blog that agrees with me so I don't seem lazy: https://lukesmith.xyz/articles/matrix-vs-xmpp/

I get your blogger's concern over OMEMO versions being out of whack and their encryption choices being all over the place, but other than it being somewhat of a mess, I don't see how it devalues the service as much as he thinks. (a bit melodramatic imo) I've yet to meet someome whos client can't decode my messages or mine theirs and I've never heard of any successful hack, but maybe maybe.