Of course Nintendo started the 9th gen. It was the first one to launch a 9th gen console. If Sony launched the PS5 first, then they would have started the 9th gen.And yeah, if Nintendo launches the Switch 2 before the PS6 or Series X 2, it will be the start of the 10 gen. What's so confusing about it?
And no, you are in the minority. Just look at the poll and the answers. If the PS5 was "only" competing with the Series X in the 9th gen, I doubt it would have 70% of the votes on the No, considering most of the forum users are compromised of Nintendo and Sony fans. And the answers also show the same thing, that they don't think that will happen because Nintendo is just too strong right now.
If you want to compare 8th gen sales, then just compare them to the Wii U and the X One. Those are the 9th gen consoles. If you want to do it in a year by year basis, however, then it's fine to include the Switch, because you are comparing what each console did on their own on that day and moment.
And why is Nintendo not part of the "generation" discussion anymore? Is it fear that Nintendo will be so overwhelming better in the sales department that you want to remove them from the equation?
You know what? It's easier to make a thread and poll about this.
This forum has more nintendo fans, and xbox fans, proportional to the consoles market share, than the avg user base of each systems.
Nintendo especially is very heavly represented on VGChartz.
Even so, your thread, "Poll - Is Switch a 9th gen console?" has the Switch at ~54% answearing "No" its not.