[rhaway84773]

Why do you think people will build houses with no street space? Anyways it’s not like street space will suddenly be turned over from the govt to private builders, but even if it was private land why wouldn’t they build land with enough space in it?

Zero parking space would be a good thing because it would indicate public transport is good enough that people don’t need their own private cars for most trips. But in practice if that’s not the case a builder is gonna be unable to sell an apartment without parking space, so they aren’t gonna build apartments like those.

And what’s wrong with 20 storey apartment buildings? And why does that preclude greenery?

[hotsauceror]

Why would a private developer's decision not to include parking, be interpreted as some kind of metric for the sufficiency of public transport in the area?

If a builder chose not to install locks on the doors of a new apartment complex, would that be "a good thing because it would indicate public safety is good enough that people don't need their own private locks for most areas?"

There is no incentive for them to consider these externalities at all. There is, however, an incentive to use that same space for something they can profit from - namely, additional apartments.

[nottorp]

Everything you mentioned cuts into their profit so it's not worth doing without any regulations.