If you buy someone else’s remodel, which can be a great idea, go over it very carefully. Lot’s people do work worse than flippers, even on their own houses. All looks no substance.
Maybe you can ask the seller for proof that they used licensed contractors and pulled permits. If you could get the bid and contracts to see how the work was scoped, even better.
If you do it yourself, you can be sure of quality.
This could matter more on houses that are older and could have more to hide.