What is the case for having parking minimums? (i.e. Mandating a certain number of parking spaces in new developments.) I guess the argument is that if you don't require developers to build it, they won't build enough. And then people will not have parking and so they will be forced to park on the street somewhere. This might annoy the incumbent residents, who will in turn complain, and so it is best and safest to just to build a lot of parking.
This is pretty much the only reason that I can think of for why a city might want to maintain parking minimums. Because, what's the worst thing that could happen if you didn't build enough parking? In the best case scenario, the developer builds fewer parking spaces and people are fine with it. This is ideal because it means people are getting around in other ways: walking, cycling, taking transit, and/or using car share. So it is the most sustainable outcome!
A bad scenario would be that the developer builds too few parking spaces, nobody will rent the spaces, and then goes bankrupt. This would be very bad for the developer; however, it would be a lot less of a concern for the city. The developer is the one who screwed up. Too bad for them. So when I see new transit-adjacent developments -- like this one here in Burnaby, BC with 14 levels of below-grade parking -- one can't help but think: WTF!