When rules have real concrete impacts that help or hurt one group over another (which is impossible to not happen), of course different groups are going to fight for or against it based on how they’re currently benefiting or not from it.
The push for removing zoning laws in broad strokes seems to be between the established current residents vs folks who WANT to be residents/or get established.
Which is cool and all, though if the desired area is currently ‘exclusive’ (which most nice areas are, the exclusivity is what allows them to push out what they don’t want, even if it offends someone), it’s hard to not see that this will destroy that exclusivity. Which will often destroy or largely alter the character of that place.
Atherton isn’t going to be Atherton (or why folks who like Atherton consider Atherton so nice), if every lot could be subdivided to high density condos, for instance.
Removing the ability to stop that would certainly allow a lot more people to live in Atherton, but it’s not like we have a shortage of actually livable space anywhere in California, or the US.
We do have a shortage of space where people want to live/be right now, but that is inevitable no matter what we do - and a lot of the high demand areas are because of the existing exclusive rules
More people want to be in the ‘place to be’ more than the ‘middle of nowhere’ (or close to jobs not in a place with no jobs, or in a place with beautiful views instead of the middle of a wasteland, etc!) and that creates a demand gradient where the most in demand places are always more in demand than they have supply, assuming supply is less than infinite, which is almost always is for real estate.
If it’s ‘exclusive’, that generally means even more restricted supply.
Harvard only allows so many students, for instance, and it’s not because they could not actually teach more to some standard. Making it so Harvard has to admit anyone who applies means Harvard isn’t going to be exclusive anymore, and that’s going to change what Harvard is and means a huge amount pretty quick.