I don't understand why this framework has become so popular. You can't instantiate or program around `FlowSpec`s. The type safety is terrible (you're supposed to just haphazardly assign to `self` whenever you need to persist something across steps). `step`s just feel like glorified jupyter cells.

There's been so much great innovation in the ML ops space in the last few years and metaflow puts you in a straightjacket that prevents you from tapping into any of it.