I’ve always wanted a form factor that’s basically a thick tablet, but with laptop-level hardware inside. I can carry around a (mechanical) keyboard and a wireless mouse just fine. Have something to prop it up vertically and give it a power adapter, and that’s all I need. Even the best laptop keyboards and touchpads kinda suck.
Not many companies would take a chance on a form factor like that, but an old Framework motherboard could make it work. I think there are some 3d printed projects on their forums that are pretty close to this already.