Portability is a HUGE benefit. It's the reason Doom on Switch is better for some people than Doom on other platforms. Hell, it's the main reason many bought the Switch (well, the main reason for those outside of Nintendo fans), if it didn't offer portability I don't think it would have sold nearly as well as it has. And motion controls won't really benefit Switch titles like it did for the Wii, since you can't really use motion controls in portable mode, or at least not in the same way as you would with split Joy-Cons when docked. Polygon wrote an interesting article about the motion control situation.
Ultimately, 3rd-party developers just need to bring well-optimized ports to the Switch and I think most would be happy. Did anyone really buy a Switch for the motion controls or HD rumble? Motion controls aren't a selling point like it was for the Wii (both because motion controls aren't new anymore, other systems have it, and because Nintendo is focusing on the play on-the-go-or-at-home aspect of the Switch), and it hasn't really been a focus in their advertisements. That last part holds doubly true for HD rumble, who even knows it exists aside from Nintendo fans and other really hardcore gamers? It isn't advertised by Nintendo, and is it even on the Switch box? I don't recall it even being on it, nor are you introduced to it at boot. So HD rumble basically doesn't exist to most people (and tbh I don't really find it that much different from regular rumble and I probably wouldn't have thought twice about the rumble if Nintendo didn't mention it in their January Direct).
And most didn't even know that touch controls were available on the Switch until just weeks before launch, because Nintendo just didn't want to mention it...and you run into an even more serious problem with them compared to motion controls, in that you flat-out can't use touch controls when docked.
So I return to my original statement, aimed at third-party developers: For multiplatform titles, just bring over well-optimized ports to the Switch. They don't need to have motion controls, HD rumble, or touch controls (if they do utilize those extra features, cool, but they're not necessary to make a great experience, although HD rumble should be the easiest of the three to implement).