It also sounds like a mechanism to induce appropriation of property of small landowners to big corporations and interests, and not sure this furthering of concentration of land and wealth is great for local communities either. It basically gives more power to those who already have more power.
If you had such a theory, you would have a much easier time using taxes to reward things that society benefits from, and dissuade things that society suffers from. It's a complicated subject.
Your concern is absolutely spot-on.
Nor should we! That would be like a formal theory for deriving all truth. It would be awful absolutism (and wouldn't actually be real).
Well, all moral truth, anyway. Wouldn't tell you much about physics.
A transfer tax is decent, but it can be sidestepped by just holding land and selling when the tax changes. Land holding is a long game.