You obviously forgot about the original Xbox that had a DVD drive but didn't play dvd movies.
That was due to DVD video licensing royalties. I think they were up to $20/player at that time. Console hardware is already sold at a loss and the original Xbox was made from expensive PC components. The DVD remote dongle unlocked this capability.
Wii was the exact same, but there was never an official option. It was hacked in via homebrew.