The Wii U could play Wii games. The Wii could play GameCube games. The Switch can't play old Nintendo games on physical media because it uses a different game card form factor from the other systems.

and none were able to play titles going back two hardware generations. Although the Switch doesn't offer any kind of backward ...

Were it not for its Wii U (and Nintendo Switch, eventually ... of the series and is one of the best Metroid games that you can play today. By this point, the formula had been tweaked and pruned ...