As for the other reasons why Soatok thinks Signal is better, well those are cherry picked and highly opinionated

In the Signal article yes, by design those are his opinions on what the minimum requirements are for “beating Signal”, which are not all objective truths. These articles come from a response to people evangelizing one messenger or another to him, some of which have “stronger” security but negatives in other places that make them unacceptable for widespread use (especially for non-techies). In the XMPP article I think the remaining points are very fair in terms of how the XMPP ecosystem works today.

Signal is a snake-oil vendor

Post-quantum encryption is an active R&D field with no proven to work solutions yet

Okay, that’s enough of my time. These replies are for the benefit of others, and I hope I’ve said enough on that for people to make their judgments with more info that what you initially were responding with.