What does then? The Switch is considered Gen 9 because The WIi U was a massive bust.
If they had back to back bust would the Switch have been Gen 10 then?
Why is the X1X not considered a new generation? The PS4 pro was barely an update but consider the original X1 and the X1X - huge difference.
What causes a generation change?
It's not rocket science Switch is 9th gen because it's a new platform succeeds a 8th gen platform yes it's that simple, X1X and PS4P were not new platforms they were versions of current platforms hence why they're not consider new gen platforms they didn't succeed the X1 and PS4.