This is what scares me the most.
I absolutely agree that they need to "play it safe" this time.
But for their consoles they have had a "it's not worth launching something unless it's really innovative" philosophy for quite some time. And if they decide on some bonkers idea that screws with my simple wish, a better switch, I think I'm going to be disappointed.
And I say this as a guy who has loved Nintendo and their products since I got my NES back in the 90s. I stood in line to get the Wii at launch, heck I even liked my Wii U. (Even if it was under powered and confusingly marketed, I liked that they tried to do something new...)
But this time Nintendo, just stick to a good, solid, backwards compatible , iteration on your original idea.
I mean a pianotuneR (as in a guy that tunes your piano) is pretty expensive.
These apps seem to be marketed as tools for professional piano tuners. And looking just at the screenshots it looks like it has a lot of tools and features outside of just showing the correct pitch.
If tuning pianos is your profession, paying 999$ once and writing it off as a business expense isn't that far fetched.
(Better be a bloody useful tool though ;) )