How is getting your own money back, many years later, without appreciation "equity working in [your] favor"?
Without the appreciation (and leverage multiplying that), buying housing would be nowhere near as good an investment. (As it stands today, it's phenomenal, of course.)
I'm on team "own the home you live in if your circumstances allow", but if there was no appreciation, your equity isn't "working for you" in any way that I can detect/imagine.
Building them in random lots in Florida or upstate New York is exactly what builders were doing in the runup to the financial crisis.
Building them in already-dense places is always tricky because of NIMBYism