Funny, the IoT space has bought into MQTT but the general internet space has not.

MQTT scales and works. And it's easy, fast, and small.

I've been trying to get our guys to do MQTT-based pub/sub, and they're rather do their own thing with web sockets because MQTT is scary. <shrug>.

That's the problem when front-end guys make decisions about tech sometimes, they choose stuff that seems easy to integrate without caring about things like deployment, scalability, capabilities, etc.