I love XMPP, but its OTR plugin is kind of glitchy.

traction? the xmpp moment was 20 years ago. it's over now

Make a single cross-platform client that implements every non-humorous XEP. If you tell people "on Android you should use this app, on iOS use that app" - you lose regular people fast. If you have a feature that only exists in one app on one platform, you also really lose people.

People don't really sign up for protocols, they download apps. Like I often refer to the fediverse as "Mastodon" even though I know that's not entirely correct, because it's the fastest, easiest way to communicate what I'm talking about - microblogging. So you really need a single, good app you can just tell people to download.

I think the article brushes over something that adds (IMO) a ton of friction to Jabber/XMPP: self-hosting your own server. About 6 months ago, I tried to go down the awesome selfhosted XMPP servers list and it was just so painful I ended up finding an alternative stack.