Now that I have written 3 apps, of varying complexity, for IPS4, I thought I'd share some feedback.
If you're using something that's documented, things go very smoothly. A pretty simple app with notifications, e-mails, a handful of settings, and a simple pruning task only took 45 minutes and about 30 lines of code. That's a tremendous improvement over IPS3.
If you're using an endpoint that's not documented, you're left to the mercy of the content in the forums and usually a 4
Thanks for the feedback We're currently building a whole new developer area that will have properly-categorized docs (focused on the backend). There's a lot to document of course, so it's something that we'll build up over time, but we'll be launching the first version in the near future.