Nintendo consoles are locked down, solely designed to force you to spend top dollar on the latest Bing-Bing-Wahoo games and late capitalism subscriptions so you can play with children and manchildren alike. You get the choice to buy BingKart Horizon for $80-90, or buy the old Switch 1 games again, full price, because they didn't want to bother releasing a 5MB update to unlock the framerates and resolution in the original ones. Nintendo wants more money, fuck you, pay more.
Steam Deck is effectively a gaming PC crammed into a handheld. It uses an open OS that you don't have to root, so you can install almost every game humanity has ever made, including all the previous Bing-Bing-Wahoos. You can get any of these games for FREE (if you're smart), or just wait for a fire sale held several times a year. We can vaguely count on someone eventually developing an emulator to work with Switch 2 games one day, saving everyone money in the long run, because those angel developers that operate against the wishes of corporate gaming cartel oppressors are the closest thing we have to Santa Claus and Jesus doing a fusion dance. The Steam Deck is how we forgive Gaben for never releasing HL3. Exclusively played by giga-manchildren.