I don’t think Nintendo has really cared much about graphics since the gamecube era. They realized that people buy their consoles for the games not the graphics
I doubt they would make the console significantly more expensive by adding a GPU that most people wouldn’t really care much about
I think that in an already niche market, it is hard for the average consumer to even further differentiate them into their own niches.
Plus, they’re in the same market. I can’t see someone owning both because they have completely different use cases. If you buy one of them you basically already can do most of what the other one can.
It’s kinda like comparing a Honda Civic to a Ferrari. Yeah they are different, but they are still cars and have a lot in common.