Why are classic 4 door sedans "disliked"?

I have a 4-door BMW 740i, but just so I can haul my older parents around in comfort and ease of egress for them. I've always owned 2-doors my whole life. Now I've had some 4-door dually pickups, but that's not a car. For me the #1 reason I like 2-doors is that they have longer doors, and never having kids I never needed to worry about anyone getting in the back.

Tom