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most retro games back in the day ran at 60 fps.
The power increase for the next Switch will be hugely beneficial to 3rd party studios that don't have Nintendo's technical wizardry with the hardware. I can't think of a better example than Deadly Premonition 2, which sank to single digit framerates in the overworld. Basically, Nintendo needs to maintain some parity with the nextgen so developers aren't left with having to make huge concessions on getting their games running. Think back to the Wii. Publishers saw little return in investment having to cook up a unique version of their multiplatform games for the system.
Framerate for old 2d/pixel/sprite based games did matter, but wasn't something we really thought about in America. For instance look at what people in Europe with PAL SNES systems had to deal with. PAL ran at 50 fps which appeared "slower". Once they got a taste of a US/JPN NTSC SNES/SFC running at a nice 60 fps, you saw a lot of Europeans importing consoles to play the games the way they were intended.
Here's a site that tests if your eyes can differentiate 60 and 30 fps. See a difference in the first and second row? -- https://www.testufo.com/
Retro gamers don't particularly view mobile gaming favorably, which is why a rerelease of the DS games on console would be a huge deal.