>>45426865>Therefore, a generation selling well is reflective of the previous generation being good.It's entirely relative and that thought process only works for yearly franchises if at all.
There are other factors, like whether or not it's the first big console release in a while, if the game has had any 3D/HD/VR titles before, and so on.
SWSH had all of these factors and more, it's to the point where the effect Gen 7 had on it is minimal. The only thing Gen 7 "influenced" Gen 8 for was the godawful map design and gameplay.