While the process took way too long and was very annoying in general, I loved the animation showing Pikmin moving blocks of data between the machines.
As a technical person, I would have loved a progress bar and a data rate display even more, but a cute animation like this is text second best option I guess.
A number of the UI elements, namely the system settings pane, the detecting network popup, and the keyboard, have a very Android like look to my eyes.
Is there much known about the underlying OS for the Switch?
Though I believe the Shield uses a form of Android, and the Switch uses a lot of Shield components so it's plausible that the Switch OS is similar to Android
Depending on the unit's battery life under a light load, it could be awfully interesting to try and put together general-purpose consumer apps for it for use as an "iPad alternative" - ebook reader, video podcast downloader, etc.
will be interesting to see how well they manage to lock down the rest of the system