For what it's worth, I don't think things from the past are inherently better than things from the present. And I also love the direction that Nintendo has taken the Switch in, and I think it was a wise and effective choice.
That said...the Wii nostalgia is really starting to set in.
Now that we're a sufficient distance away from the Wii, and Nintendo's current direction is significantly different, I think the pros and cons are starting to shine through.
Mostly it was this video about ordering pizza on a defunct Japan-only food delivery channel that hit me hard with the feeling. The Wii was in that era where game companies were convinced that the future was making an "all-in-one" media device for the living room.
We didn't know back in 2006 exactly how smartphones or smart TVs would become the ubiquitous all-in-one devices. So Nintendo designed the Wii to be a place to check the weather, check the news, share your Miis, vote on polls, and I guess maybe order dinner. There was no standard UX practices for how these things should be presented as apps back then, and Nintendo seemed adamant about crafting each of these experiences with their own charm and personality.