For multiple periods spanning over two decades in my life, I greatly appreciated the opportunity to live indoors without having to first purchase a house or apartment where I wanted to live.
That is possible without landlords. Gov't provided housing, for instance.
I greatly appreciate not needing to live in govt housing without buying a house.
I am assuming you are basing this off the failed and racist public housing that has existed in America. There are better ways though, I assure you.
I have a house. I rent out the house. How am I limiting supply?
It is one less house people can buy.
And one more they can rent.
If I buy a house, don't live in it, and don't rent it, that's limiting supply.
It is one more house they won't be able to buy and build equity with. Meanwhile, they will have to pay more than what the mortgage is to rent (you are extracting some kind of profit, after all) and have nothing to show for it at the end.
By that logic, if I buy a house and live in it, I'm also constraining supply, because it's one more house someone else won't be able to buy. And, sure, it's true, in a nitpicky kind of way; they won't be able to buy it. It's also so absurd that your definition of "constraining supply" is clearly useless.