Out of curiosity, why couldn't property taxes be progressive? What stops Texas from having different tax rates based on the value of the property?

It even seems like it avoids a lot the pit falls the uber-wealthy use to avoid most progressive income taxes. Its easy to disguise income as something else. Property, though, is right out in the open. The state can easily audit and value property and send the bill. No matter how fancy the accounting, that bill will eventually reach the person "consuming" that property.