Currently the Nintendo Switch has a 32GB limit on game cards, which is why Bethesda spilt Doom into two parts. The campaign shipped on the game card and multiplayer was a separate download. This sort of thing may be the norm for a while longer.
According to reports, Nintendo won’t start supplying 64GB game cards until 2019, which is six months later than the original mid-2018 target date. The reason is “technical issues” and Nintendo wants to make sure that product quality is up to their standards before they release it.
This means that some publishers that might delay releasing games that need the extra space. Sucks for us. The launch title Legend of Zelda: Breath of the Wild was only around 14GB. Doom required about the same space, with an additional 9GB for multiplayer. It didn’t feature the game’s level editor mode, Snap Map, however. When NBA 2K18 was released in September, the physical version required an additional 24GB of space. Things were similar for WWE 2K18 a few months later.
We are just going to have to wait until Nintendo is ready and feels that the quality is there. Until then, publishers and gamers are going to have to deal with it.