I can say that growing up in South Central Kansas, we definitely did not consider it Western Kansas. IRL and on various boards, including this one, it has become a weird flex to pejoratively refer to the vast majority of the state as Western Kansas, without regard to geography, climate, or anything else other than a weird brand of hubris. And that's without getting into the implied premise that Western Kansas folks are somehow "less than." I don't accept that as a given.
"Everything west of Johnson County is Western Kansas"
"Everything west of Lawrence is Western Kansas"
"Everything west of Topeka is Western Kansas"
"Everything west of Manhattan is Western Kansas"
--> Things self-unaware losers from Kansas say.
As you can tell, the scales never fell from my eyes.