Open floor plan is a failure and lets be honest was invented to make smaller houses seem bigger than they are

And it succeeds at that, offering more room for those who either can't afford a larger house or who can't get land in an area close enough for commute.

Open floor plans also simplify central air conditioning, requiring fewer ventilation ducts on the main floor.

Acting as if anyone is wrong for their preferences while asserting your own is weird.

If you want a house without an open floor plan, great! But some of us like an open main floor.