Think of it like overfishing: you could just as easily say overfishing is a public problem that private fishermen shouldn't be "forced" to solve through quotas. Some fishermen used to believe that, too, right up until the day there weren't any more fish for them to catch because they'd destroyed the population they relied on for their livelihoods.
If housing costs in and around SF don't get under control soon, we're going to have a lot of very rich people who can't do much because there won't be any Uber drivers, baristas, waiters, garbage collectors or really any lower-paid service-sector people to keep the area functioning. And that will pop the housing bubble in a way that's devastating to developers, but they currently don't believe they have any incentive to head it off -- let somebody else build the cheap housing, I'm going to build as expensive as I can!
I would agree about the in-elasticity of the labor market, we're finding out right now. I see plenty of hiring signs around.
So luxury condos and basic apartments either don't exist, or are identical to each other?
Unlikely. I strongly suspect you don't actually understand anything about physical construction given your seeming belief that all housing units are fungible. So I'll simply state it for you clear and plain: they are not in fact all fungible.
And it's not their fault if only enough housing is being allowed that they can get away with making luxury only housing.
Ah, it's the evil gubmint's fault. Well, that explains a lot.
Did you read what I said enough to make a counterpoint with new information or thinking? Care to be wrong about other things?