Okay, I'll bite. I own a house. Now suppose I buy another house. It's empty. It's not someone else's home. Under the proposed rule ("you don’t get to own somebody else’s home"), I can't rent the house-shaped building to someone as a residence. So now instead, I'm turning the second house into a pig farm and hiring laborers to raise and slaughter pigs on it, because the state insists that I have to put the land to work. [That's what property tax is.]
I'm still profiting off of someone else's labor, the would-be tenant is homeless, and I'm destroying a neighborhood. Somehow this doesn't seem like a win to me--for anyone.
I am strongly in favor of protections for tenants: no one should be constructively evicted, rents should be controlled everywhere, and price-fixing by landlord cartels should result in prison sentences. BUT rental residences arise as a natural consequence of the freedom to contract. The solution to slumlords who fund entire generations of descendents by lucking into a valuable tower at the turn of the century is not "getting rid of landlords." It's just tax.
Full disclosure: I'm not a landlord, but I've both rented and am fortunate enough to own my own home now. I have also litigated both sides of evictions. I've seen bad landlords put the screws to impoverished tenants, and I've also seen spiteful tenants utterly destroy properties with essentially no recourse. This is not a problem you solve with magical thinking.