Standard policy is I think mostly the same, but in Europe there's been arguments that those policies don't follow the actual consumer protection laws, which is a whole thing that I don't think really resolved one way or another.
It varies with country but I believe a number of protection laws specify normal use/testing a product is allowed, so you can open boxes and test functionality (norwegian law does this for sure). Excepting videogames from this is arbitrary, the argument from consumer protection agencies goes.
I believe in practice a number of games did get refunded when threatened with formal complaints along these lines, but that's far from a guaranteed thing.
Anyway, GOG decided to go with the generous interpretation (and the one all kinds of electronic goods except games and CDs/DVDs have), which is nicer for everyone, really
That would be illegal in the UK I think, since you have 1 year mandatory warranty against any faulty goods.
"I misread the minimum specifications" does not a faulty ware make.
Neither does "my PC runs a thousand different games but this one crashes" a faulty computer make.
Battlefield 6 won't run on your PC unless it has SecureBoot enabled. It's not included in "minimum specifications."
I don't see how that is relevant to Oblivion, nor how you'd buy Battlefield 6 plastic wrapped in a store.
Warrantyis thę same as return. If there is nothing wrong with goods, warranty does not apply. Return means return for any reason.
This is probably a US vs Europe difference in consumer protections though.