The richness of games available would not be possible if Nintendo was not in the picture as a hardware manufacturer and had to target all their games at MS/Sony hardware.
Sony & MS have almost never tried any novel hardware and been able to tie it to unique gameplay that was actually successful. They've only tried to copy Nintendo's ideas, mostly failed, and then cancelled the hardware. See Kinect, Playstation Move controllers for PS3, etc.. it was all just copying the Wii.
A lot of the games on DS and 3DS would never have seen the light of day with their unique gameplay elements without Nintendo doing the experimental hardware required.
Either it is, or it isn't. From there you can determine whether you should spend your money there or not.
Nintendo isn't stupid, if people stop buying their consoles and manifest wanting just the game for another platform they will eventually do just that; but their large customer base is saying that the price of the console is worth it and Nintendo deems it better that way so it will remain like that.
If I already have a PS5 (not out yet, but which is already purchase worthy) then I would say f--- yes to even a $100 Zelda (were it available).