Miitopia isn't very deep, or very difficult (at least until postgame), but it's a lot of fun. Speaking as someone with original characters of my own, being able to assign them roles and see them interact in funny ways was more than enough to hold my interest. In my opinion this is a great game to wind down with at the end of a day.

A good chunk of my time was spent in the extensive Mii creator, which is arguably worth the price of admission in itself if you're willing to experiment and push it to its limit like I was.

Not sure if the new additions would be enough to convince someone who bought it on 3DS to pick it up again, but the very nature of the game means no two playthroughs will be quite the same anyway. I'd definitely recommend giving it a shot if you want something lighthearted and fun.