> How can a major mobile platform (THE major platform?) be such a rats nest to begin developing for?
The great mobile stagnation has begun. We're at least a few years into that now.
The mobile market is no longer growing (and or barely growing) based on usage and unit sales. The market has largely been saturated in terms of time and devices. Even India is heavily flooded with smartphones now, and it was one of the last great potential markets.
So what you have is a large group of existing developers with experience and a gradually reducing group of new inbound developers pursuing a shrinking number of free (widen open) opportunities (in jobs, in new apps that can be created, etc). It will end up mostly being a replacement system, where as developers slowly age out or leave, that's the max inbound new developers you can fit into the stagnate market (to have it be any other way, you need more growth than exists now, or is likely to exist going forward).
The existing developer base largely doesn't need the Stackoverflow information updated, and the demand from new developers isn't as high as it used to be. Most platforms start to stagnate in this manner after they pass their peak / prime days. Mobile is aging as a thing, in other words, and you're starting to see that show up in such ways as rotting Stackoverflow info.