I've spent some time exploring UI Interactions now, and while it's extremely promising to be able to build simple flows on here, there's some serious bugs.
For example, I have a fairly straight forward approval modal where I want the the user to be able to click Approve or Reject. Then, based on whether or not a reject reason is required I want to pop up a user input modal to provide a reject reason.
This does not pop up, but when clicking on it again it pops up at the top of the page:
Another thing I've noticed is that Navigation Redirection doesn't seem to work at all.
Next EXP Developer Tools does show events being emitted, but nothing happens.
