GM does do it in the G6
The B-Pillar stuff and fixed windows is due to safety regs. You'd never get those approved.No.
By hardtop I mean, all the windows go down, even the ones in the back seat.
The only G6 that is a "hardtop" is the convertible, the coupe still has fixed quarter glass, though it does have frameless door glass like the CTS coupe shows here, so there is the possiblity that there will be a convertible CTS.
The Camaro has frameless glass too, I believe.
Wasn't the CL newly redesigned recently??Older designs. I don't think either of them has had a major redesign since side-airbags became the norm about 2 years ago.
I'd expect the next versions to add some sort of support.