I have a 2018 Model 3 and your description of BYD is exactly how I would describe my Tesla. It feels cheap and plasticky and it creaks. I also briefly had a Model 3 rental car that was newer than mine (but I don't know what year it was) and it also felt the same.
I had thought about throwing an exception for Tesla because they did manage to create cars that people outside the US want. So I guess that does count but I doubt they're what anyone thinks of when they think of American car makes.
Oh I would for sure buy a BYD today if I were able. The ones I've ridden in have been really nice. I mean they are literally plastic but so is every car in the "economy" price range. I don't think their interiors were noticeably different than any other non-luxury car. I've been told that their higher end models don't have this problem.