Not that I saw and that's my biggest problem with it, email isn't going anywhere. I can not use it to talk to my friends and family, sure, but I can't get away from using it in conjunction with like, websites or some government things, etc.

Furthermore as far as chat apps go, there's not really a perfect one either:

Signal's phone number requirement (and maybe they fixed this part, but back when it had sms if someone deleted the app without deleting their profile first, my messages would still get sent to signal and since they don't have the app installed anymore I lose contact with them, and there was no way to force it to use sms, happened with like 4 contacts). I think a couple other issues I can't recall while shitting at work right now too.

Matrix was started at Amdocs which is sketchy as fuck and associated with mossad, all the apps suck, and it's too hard for normals to use (I know, "get gud," they won't.) Leaks metadata like a seive, too.

Jabber is cool, but also not perfect, there's issues with OMEMO implementations, and Conversations eats too much battery without play services. Still metadata too.

Delta Chat is what I'm trying now, but it's PGP based. Absolutely love it other than that though. At least they're attempting to reduce metadata but there's still some by nature of needing to know sender/recipient.

If anyone has a better suggestion for chat apps, I'm all ears, but that still doesn't solve the problem of email's ubiquity, either. If this blogger proposed a solution, I missed it, but until there is one and it gets adopted this is just what it is.