What is creditworthiness if not a proxy for the same thing anyway?

Which is exactly the goal, every landlord would rather have ridiculously rich tenants, and most wouldn't give a single shit about what happened to the people who weren't.

Of course, but rich people are on to that scam already. I would wager that most of those who can afford to own a home do, simply because they don't want a landlord as a liability.

You'd lose that wager. There are many reasons why someone who could pay for a home would choose not to - e.g. maybe they do not plan to their in their current geographical area for a long enough period of time for it to be worthwhile, the cost of renting vs. owning in their area is low, they do not want to be responsible for maintenance, etc.

Edit: I now realize you said "most". You would not lose the wager.

Where is the data set on this?