Not that I disagree with your point about walled gardens, but "better" hardware for a handheld gaming machine needs to have a decent balance between performance and battery life. Longest plane or train journey that I'm likely to take is about five hours, and I'd need to rate any gaming hardware on the ability to run for that length of time. On that basis, the Switch is pretty much optimal. My phone has a higher resolution and can probably push more frames, but it would run hot for about forty-five minutes maximum. Plus, I'd then not be able to make calls or listen to tunes at my destination.
Steam deck would probably be a better choice, though. Fuck Nintendo.
Programming a robust global date-time system and having a transparent conversation between metric and *imperial/traditional" units is just a warm-up to show that you can work with the truly demented currency system. Make sure everything is rounded off to the nearest whole ha'penny.