Nintendo caters to a casual crowd, just the right type of people to not want to faff about with setting up emulators and pulling games on hip new systems. Non-techie people like to e.g. not have to troubleshoot crashes at the boss cutscene 2/3 the way into the game (as an example of the issues BOTW Wii U emulation had for a long time after release) or understand shader stutters and options to work around them.

I think the other part of it is we're ~7 years into the console's life and it uses a ~9 year old chip that was weak at release. Their next console seems imminent and how many years of "emulation doesn't even work anyways and if it did you'd need to do it on a beefy computer" will that give again?