Two APIs moved from one package to another. That's all. I understand it can be frustrating but there is no big change to learn here.
Your code will still work in 15, and we print warnings telling exactly what to do to prepare for 16. And we provide tools to automate this change for your existing code.
I figure web development today works like this: there's no reason to learn any framework thoroughly, because other people did already and there's enough them on StackOverflow to get you out of any difficult situation. The landscape moves too fast for learning anything to be worth it.
Also, most webdev is pretty throwaway, which means it's totally fine to get yourself out of trouble with piles of unmaintainable hacks. It'll all get rewritten in a new framework du jour two years from now, anyway.
