The goal I have for Pypeline is much simpler: let you easily setup data pipelines where you leverage processes, threads and asyncio where they are good at. So in my mind a killer app would be a pipeline that maybe starts with an asyncio stage for e.g. downloading images, maybe then a multiprocess stage for e.g. doing image processing, and finally a threading stage for e.g. interacting with the OS.

Right now I see Pypeline more as an easy to use single machine tool instead of a higher level distributed abstraction like Celery. Maybe other framework could leverage Pypeline to ease their work.