It's possible to write crappy code, async or otherwise. In my c# world, I use async methods for REST endpoints, which in turn use async calls for anything IO-b

It's possible to write crappy code, async or otherwise. In my c# world, I use async methods for REST endpoints, which in turn use async calls for anything IO-bound (database, message bus, distributed key store, file system etc). I think more often than not, it's done correctly.