However, you don't have to if you die and pass the property down to your spouse and/or children. This is the step-up in basis and is key to building generational wealth in the US.
Yes, but for most people, that's not really a benefit. It's possible to exclude the first few hundred thousand of capital gains taxes on a primary residence anyway. So even without the step-up basis, the tax burden on these properties would be tiny.
Property taxes are a much more significant form of taxation than capital gains. And would be even without any preferential treatment.
In those high-demand areas, owners will simply pass those tax costs down to their tenants, and the rents prices will go up, leading to even less affordability.
Not everyone wants to buy.
Renting doesn't need to be handled solely or even at all by the private market.
If you make the costs of real estate investment so onerous that it’s only attractive to owner-occupants then it becomes far harder for your landlord to exploit you as a tenant, as the option for you to buy much more cheaply will be there even if you choose never to do so.
Reasonable tax breaks for your primary or only home, and none for second homes / investments you let out.
That gives a valve to perform qualitative easing on the housing market whenever you need to, and is not uncommon in other parts of the world.