People got excited about it as a pattern, but usually apps don't have that many things that really have to go in the background. And once you do, it becomes really hard to ensure transactional safety across that boundary. Usually that's work you want to do in a request in order to return a timely error to the client. So most jobs these days tend to be background things, pre-caching and moving bits around on cdns. But every single one of those comes with a cost and most of us don't really want a mess of background jobs or distributed tasks.

I just added a RabbitMQ-based worker to replace some jobs that Temporal.io was bad at (previous devs threw everything at it, but it's not really suited to high throughput things like email). I'd bet that Temporal took a chunk of the new greenfield apps mindshare though.