It's kind of weird that the Switch has a touchscreen, but presumably games aren't allowed to rely on it because it would prevent them being playable docked. I assume there's an official policy banning handheld-mode-only releases, because otherwise Rainbow Curse and maybe even a new Elite Beat Agents would be no-brainers to release on Switch.
Also as a minor note, Sonic Lost World has crossover DLC levels based on Yoshi and Zelda that are exclusive to the Wii U version. And I think one of the Skylanders games has some figures of Mario characters that only work on Wii U.
The shattered stage is set and there's a role you must fulfil