Because you can't see out of them. The MPV type window arrangement feels claustrophobic; you can see straight ahead and through the side windows, but the view at an angle is obscured by heavy pillars. Why this backward step in car design? Have car buyers just got used to it because: "that is how it is...". Good outward vision will be strict criterion for my choice of next car. A shining example of good design is James Bond's DB5 which has been much in the news recently; look how the windscreen nicely wraps around, this was common for many cars in the 1960's.
Good design