It is my understanding they do. This is the case especially for terrain related things such as in Frostbite. Perhaps ID megatexturing, in the case somebody still cares about them. Even games which are not streaming can still be more conservative before trashing old data.
There's of course the option of higher res assets.
My suggestion is to not mind those issues. It's a boatload of work and in the end, not required for market.