The N64 controller for Switch is very much a novelty, and as a result is purely ancillary to the experience of playing N64 games on the console via Nintendo Switch Online's Expansion Pack tier.
Having the pad is nice, of course, for those looking for a more authentic N64 experience on the Switch. After all, button layouts between the N64 pad and Pro Controller differ significantly, which can make certain games a little awkward to play. That's especially so for any games that make liberal use of the C-buttons.