>>712718759Switch 2 is a clearer name than Wii U. It is clearly a console, not a peripheral.
Switch 2 comes with Mario Kart World. Mario Kart outsold NSMB like 5:1 and World has a big, obvious new gimmick to make consumers go "Oh, this one is DIFFERENT! Wow!"
Switch 2 backwards compatibility was advertised better, and the Switch had far better core audience support and a very long shelf life, so people understand they can keep their existing games. The digital storefront being better also means people probably had a bunch of tiny, cheap games to tide them over.
Nintendo advertised Switch 2 will UPGRADE their Switch games, and the two biggest examples they gave were the smash-hit Switch launch game and its recent sequel. So some people are grabbing it like it's an iPhone revision and people who held out on Switch 1 are grabbing 2.
Switch 1 running games poorly was a big complaint, especially in the last few years. Consumers are eager to upgrade. Most Wii owners were fine with performance on Wii and didn't see a need to upgrade.