Their form demo is definitely worth checking out. You could build the same thing with a Next API route. You’d need to write some code to do the validation that they do, but it should largely look something like their hook does. Hopefully Next will build something like it because this is a much more sane way to write forms than the controlled inputs and state way.

I do think it’s nice having it in the same file as the form itself, but it’s not clear how well that’ll scale in a more complex page with many forms. So I think Next could get most of the way there with a few helpers to make a form submit to an API route with similar DX.