Resident Evil: Revelations 1 and 2 will launch for Switch on Nov 28 in the West and Nov 30 in Japan

[Soundwave]

RE Revelations on Wii U was 13GB.

RE Revelations 2 takes 20-30GB.

These games take space, that's just all there is to it, it wasn't going to fit onto a 16GB cartridge, and going above 16GB likely would mean the game would be more expensive and it still probably wouldn't fit on a 32GB cart.