I'd love to see them lean back into the idea of it being a console you can take with you on the go again. I miss a lot of the portable and social features the DS and 3DS had, things like DS Download Play, PictoChat, Swapnote, the camera apps, and
especially StreetPass. I loved when games like Pokemon B2W2 and Pokemon XY/ORAS had things you could do based on who you passed by and just happened to connect with without directly linking up in-game. Seeing someone in my passerby list was really exciting and having little side modes or games where I was incentivized to go out in the world with my console so I could find and connect anyone and everyone I came across was really exciting when I was still in school and going out every day. I think the Switch is a great console but it didn't
feel like a handheld Nintendo console because it was missing all of those attractions. The Switch is a fantastic console but it doesn't feel like it was made so you could take it places and play with other people, it feels like it was made to be a home console and they just decided "I dunno I guess you can carry it around with you".
And I know this is a popular thing to say, but I really miss a lot of the customization options. I want my console to feel like
my device. I want to organize my games and apps in a way I like, I want to have different themes or profile options or music for my home screen based on the games I like to play or whatever thing I'm fixated on at the time. Custom 3DS themes (while they're definitely too open, I figure the best we're gonna get is "Here's one theme based off this first-party game") were such a joy to have and really got me excited to turn on my 3DS and play games on it. I love cosmetics and I love organizing my belongings. Having a ton more options to make new profile icons was a nice addition to the Switch, but that's basically the bare minimum. Everybody's Switch menu basically looks the same even several years after the console's released. I want themes and other customization options, I want my menu to look and feel like something like the PS4 or 3DS.
The Switch was and has been a great console that I like a lot, but it really feels bland and kinda boring. It feels like a lot of the cool stuff from previous years were removed to make it overly simple, and I think that was a terrible decision.