Ok thanks!
@mikethompson I've commented in far too much detail on https://github.com/day8/re-frame/issues/639#issuecomment-677958692. Short version is I think reg-event-fx is fine if the "no handler registered for effect" error check is refactored to only consider the :fx value.
I think this should be day8.re-frame/async-flow-fx
you were right i'm an idiot
thank you btw