What I figured out is that... it's really hard to get this type of thing right. The more generic something is, the less useful it is. Zapier is a pretty amazing tool but it's also incredibly difficult to write all of their integrations. This tool suffers from a lot of the same problems (integrations are where the value is).
It's cool to see others talking about this though. It makes me want to Open Source the core tech we used to build Refinery (including the half-baked version that uses Temporal for long-running action sequences).
Thanks for the reminder about this!