It's weird that the Game Boy Color isn't seen as its own platform. It had you buy new hardware for new games, after all. Games with color was a major step up I wonder what the breakdown is between GB and GBC hardware. Yeah it was backward compatible, but that isn't terribly unique. I'm sure it would make the Game Boy years look much less impressive.
I think it's weird, almost like if years from now, Nintendo just grouped the Wii U in with the Wii. New hardware for new games, HD is a major step up, but still backward compatible.
Outliers are frequently removed in data analysis to get a better picture of how things are trending.
The OG Xbox wasn't a sales darling either (near Gamecube) and the Xbox One looks to be struggling in comparison to PS4. So do you dismiss the 360 as an outlier? Yes I know, only 3 data points, but Nintendo's the only one here with this type of longevity. Dismissing the Wii as an outlier, I get it, but those franchise sales in the Wii era say to me it was more than
just soccer moms playing Wii Sports once. Adding in the SNES, Cube, and N64 TOGETHER gets you approximately Wii numbers, so that's quite the outlier.