I think you're starting to (unintentionally) argue a straw man, or at least are making assumptions that just aren't true.
No one is saying that developers should just be able to build whatever they want, whenever they want, with no oversight. No one is saying that the community should completely shut up and have no input into the process.
But the actual objections brought up at actual planning meetings that happen in SF are universally bonkers. It literally actually is people opposing change just for the sake of opposing change. If there is anyone at these meetings making reasonable objections, they're completely drowned out by the other 20 people shouting that the sky is falling.
It's protectionism, and the "I got mine, so fuck you" mentality, plain and simple.