XMPP is so bad on mobile that this persistent connection thingy and the whole XMPP protocol itself are effectively what prop up every single push notification o

XMPP is so bad on mobile that this persistent connection thingy and the whole XMPP protocol itself are effectively what prop up every single push notification on Android and Nintendo switch. True, Android vendors made a habit of killing background apps for misguided battery optimization reasons (less the case nowadays), which XMPP taught itself to work around in 2014/2015. Same for media, it just works, you should try it? And funny you mention WhatsApp, it's effectively a dialect of XMPP running on a fork of ejabberd.