Generally curious, but how do you (and everyone else) know when the game drops to a certain framerate, and how do you know exactly what framerate it's running at? Are you actually measuring it somehow, or do you just "feel" it?
My iPhone pro is a high refresh screen, my TV is 120hz and my gaming rig has a 7900 XTX. Going from that to 30fps is a pretty jarring experience. Obvi it is a small handheld device from 2017 so the expectations need to be set correctly - but doesn't change the experience. Nintendo has always been at the bottom when it comes to graphics though - but that is intentional.
I don't think it's a huge deal but there is a ton of footage of youtube that does frame-by-frame analysis and "30fps dropping to 20fps" seems very accurate.