In node.js I've seen time and time again some slow task that happens only every now and then, but which causes significant latency spikes. Having the one single event loop, with tasks big and small, from all stages of the processing pipeline mixed in, feels so crude. I really want a more sophisticated architecture where different stages of the execution can be managed independently.

I also want to mention that very very very few programs do, but io_uring does let you run multiple io_urings!! Your program can pick from which completion queue it wants to read, can put high priority tasks in a specific iou.