Design guidelines are just recommendations. Frequently bad ones. A developer should design the best UI he can, not follow what Google says regardless of whether it fits. And most developer guidelines, Google and Apple both, are crap.
The problem is that the whole app movement has brought in a whole slew of crappy developers who's idea of coding is to search stack overflow or git for stuff to copy paste. They don't read it, don't understand how to use it right, and expect it to magically work. Worse half of the people writing that code fall into the same category, so its the blind reading the blind. If you pick a library off of github and assume it will work, you deserve what you get. Unfortunately your users don't.
These people have been around for a while (they used to be "web developers" and program by copy pasting big chunks of javascript). The problem is that on a phone they can do more damage. In a world where the number of quality programmers is fixed and far less than the demand for programmers, how do you fix it? Making it easier to program actually hurts, you end up with those crappy coders trying to do even more. Maybe its time to raise the barriers to entry for a while.