The result - stamp duty is exclusively paid by middle class people actually buying homes, never by the rentier class. They already used the money up front to buy the votes for this law apparently
It's basically excuse to get rid of poor that made a mistake of buying a house in area that turned more expensive 2 decades after.
Tax anything after first house, sure, but taxing house by value is terrible idea that never actually worked in a way proponents are saying it would