X in XMPP stands for eXtensible. They could simply augment XMPP to match their needs better - and guess what, it's exactly what happened in last years. Now XMPP

X in XMPP stands for eXtensible. They could simply augment XMPP to match their needs better - and guess what, it's exactly what happened in last years. Now XMPP is a good, modern, battery- and UX-friendly IM protocol, with some clients even E2E encrypted by default.