I'm just saying I don't see any exact limit of the capability of a system either graphical or otherwise. Give developers enough time with one system and eventually they'll probably create the technology to do things that the system was never expected to be able to do. I like to use the
BlueRoses engine for the GBA as a great example of that.
Processing power is defined and creating a game to use all of it is simple, so simple that it can't really be "the limit". Chucking out more detail into a game while staying under that limit is another thing that doesn't have a defined limit and personally I think, even though it exists, such a limit has probably never been hit for any system. My question is, what would be considered a realistically reachable limit between those two limits?