You say this like they didn't spend the last decade selling 75 million devices that barely pushed ~360p, and making a small fortune from it. I get wanting Nintendo to bump the hardware (I'd love a beefier Switch too), but they've proven over and over again that they don't need to do anything.
If anything, I kind of like that Nintendo has chosen to cede the market of "indie/port" titles, their decision to mostly ignore that market is a big part of what's allowing Steam Deck to flourish right now. And the Steam Deck might be the healthiest new development the industry has seen in 20 years.