Whaa? The Gamecube uses disks and MemCards. Nintendo hasn't used cartriges since N64 days. Am I misunderstanding something?
No... its just that Nindedo missed the boat with the N64 (released same time as PS1) and fell a generation behind.
Add to that the propriatary format they used with GameCube... provies a patter of behavior.
P.S. Simiarly... The GREATEST mistake in the PSP is that it doesn't play STANDARD DVD movies.