This has to be one of the most impressively aggressive and long rants from a user without having experienced any problem I have ever read.
I can't recall someone crashing post upgrade (I may have missed it so that's not definitive). A subset of users have had VPS issues or reported it's not quite as stable as before. Both things are non terminal generally speaking and better than sitting in the case.
You're wrong. It is very significant. Ultrasonic/VPS issues, vertical drifting, toilet bowling and instability following a DJI firmware update is a major problem. Having to ground a $1,500 quad due to a premature software update that the DJI pilot app keeps flashing until you update is unacceptable from a multi-billion dollar company. I am supposed to shoot my friend's wedding on Saturday and now can't because it is dangerous. DJI should at the VERY LEAST allow users to revert the firmware. If there are this many people posting about it on forums, you better believe an incrementally higher amount of people have called it in to DJI. So now, DJI knows about a major unsafe bug in their firmware and have done nothing. This is putting people's quads in danger, and more seriously other people's property by having tens of thousands of Phantom 3's flying erratically until they fix their mistake.