I share your sentiment.There are at least 2 of us in this thread who don't give a flying monkeys fuck what's inside a rep with a closed case back.
As long as they are sensibly reliable and keep decent time once run in and regulated I definitely don't give a shit
As for display case backs, there isn't many decorated movements that will fool anyone who knows movements, I'm no expert at all, but I can soon spot a fair few of them.
1. Closed caseback = movement visuals cease to matter
2. Open caseback, clone movements = yes looks decent but like you said the tells are still there for those in the know
3. Open caseback, clone movements, gen bridges/plates = can pass off as gen from casual inspection but often the balance wheel assembly will look off especially for free sprung movements
4. Open caseback, clone movements, gen bridges, "free sprung" movements (faux free sprung for those few produced so far, maintaining the visuals but not the function) = looks gen yes, but can potentially run like crazy, though not always. Its like sticking a fireworks in the ground and guessing which way it will take off.