I think the biggest issue with Nintendo games until Switch at least has been the abysmal frame rates. We're not talking about dips just under 60fps, there are good examples of 15fps frame rates even with the best games such as Tears of Kingdom. I think they've finally fixed that issue with Switch 2, but the horrible performance of the games have been a huge issue since forever.

And of course it does not matter, Nintendo still sells because it's Mawio (and I say this with all the love, I'm a huge Mario fan myself).