Well I love Celery, so I'm even more excited to learn more about Faust now :)
Simplicity is of course a goal, but this may mean we have to sacrifice some features when Redis Streams is used as a backend.
I'm glad you like Celery, this project in many ways realize what I wanted it to be.
https://github.com/closeio/tasktiger (supports subqueues to prevent users bottlenecking each other)
https://github.com/Bogdanp/dramatiq (high message throughput)
If you have a Faust app that depends on a particular feature we strongly suggest you submit it as an integration test for us to run.
Hopefully some day Celery will be able to take the same approach, but running cloud servers cost money that the project does not have.