So you have the state subsidise your mortgage, for a house you can one day rent out... and so on.
Is the state becoming the mortgage lender?
If you stop landlords optimising their profits, the property dilapidates, there's no point investing in it - like some of the old sitting-tenant properties which still exist. I know a few, falling apart.
In a private landlord system, there's an incentive to buy something old and grotty, and invest in it to make a variety of decent housing, which is something else councils (say) don't have enough money to do.
A big private development is going up not far from me, which the council (planners) have had a large influence over, making it look and fit much better. That control would be in-house, so go out of the window ( as it were...).
It's very easy to topple the applecart and you end up with less housing.
I've mostly got rid of mine now. I don't need the hassle. I have enough to survive my remaning days if the banks all collapse. I have not much idea what I'm going to do with the proceeds. I took advantage of silly property price rises, you couldn't do it now.
I agree that the housing system we ( and most other countries) have, doesn't have everything right, but the State doesn't and couldn't own all properties, there's a free(ish) market, and so on.
It's very easy to say what the system should be, when you're part of it but only see it from your side.
It's very easy to say what the system should be, when you're not part of it so can sit in judgment.
To get wherever it is we want to be, you wouldn't start from here.