You need people to be able to build and flip properties without being taxed at all. The current taxes are carving a modest profit down to "not worth it" for a lot of people who could otherwise build and revitalize affordable housing.
More taxes on home sales results in less homes for sale.
Speculators wanting to buy a house, redo the kitchen, and mark up the price 20% 6 months later though? We could just let older, unrenovated houses be cheap. That opens up deals to new home buyers. You can redo the kitchen after buying the house if you really care. You don't need some middle man to do it and mark up the house.
That’s the service flippers provide, IMO. (I’m not one but I think they’re more helpful than not in terms of providing housing that owner-occupants want.)