I understand what you’re getting at a bit better now, but you still haven’t explained why the current situation, where one needs to save 20% for the down payment, and then pay a monthly mortgage payment, is better for the poor.

Where are these places where the buying prices of land is cheap, but the land tax would be high? The buying prices is simply the year rent divided by some discount rate, so typically, the buying price would 20x the yearly rent/tax. That’s a large amount to have to save up (assuming a mortgage is out, like you say).