Switch 2 is backwards compatible with switch 1.
Switch 2 has better FPS for Switch 1 games. Like BotW stops having terrible FPS drops in certain scenarios.
Switch 2 loads games faster. There are test videos out there, but it's up to twice as fast.
I like the joycon 2 controllers ergonomics more.
I started gaming with Nintendo's Game&Watch handhelds, Timex 2068, PC MS-DOS 3.3, Amiga, and so on, so I do understand something about upgrading hardware for speed, or deal with what one has at home.
Though I sadly learned afterwards that you could send in controllers with drift and Nintendo would fix it for free.
Of course Switch 2 is faster and the better console (it should be), but if you're focussing on raw performance you're in the wrong crowd.
Even on PS5 you have load times and performance tradeoffs. There will be a time when we're wondering how we put up with the 'impossibly slow' current generation of consoles like we're doing with the 8-bits machines now.
I read it as "I enjoy the Switch 1 games, but I want to enjoy them even more with faster load times and better frame rates"
BOTW had issues with framerate (30fps was the baseline which isn't good to start with), and often dropped to below that in open world scenarios. TOTK has major performance issues on the Switch 1 though IME.
I don't subscribe to the opinion games have to run a stable 60fps to be enjoyable.