I decided to put this in Gaming discussion, as I feel it relates to the cartridges sizes of the Switch, at least discussion wise, In any case, the Xbox One version is similar to the Nintendo Switch version, in that they both require downloads to be playable. Thus, I can conclude that it was not done specifically because of the Switch, but because Take-Two tried to cut corners everywhere in order to make a quick buck. The game just has 4GB on the disc, and requires a 14GB download:
This doesn't even make sense though, as that could have all fit on a 25GB blu-ray.
I got the source from here: