My primary complaint is that it is hard to test (compared to "stateless" pages) and that the whole thing feels complicated.

I also feel like the learning curve is pretty steep and you can't just have a random, experienced non-Elixir dev join the project and have them fix something. They must be comfortable with Elixir & Phoenix before they get productive. I feel like it is multiple layers of complexity and uncommon patterns.

Other than that, I think it is very cool. I have very strong mixed feelings about the feature hah.