I was really happy to find this too, as the update experience (and system software in general) has been pretty terrible on previous Nintendo home consoles.

I wonder how much of Android they are using at the low levels? Android has recently gotten much, much better at applying system updates, adopting ideas from Chrome OS. Building on Android would be a really low friction way for them to get started on the system software, since they're using a Tegra chip, and it could also explain the improvement in general system software quality in Switch over Wii/Wii U.