I think carbon tubs are so stiff it hardly matters if there is a roof on there. May even be a "pro" having the weight lower. IDK. Blinking lovely car in either format!I'd imagine (probably wrongly) that the fact it's a convertible is precisely why they could offer the glass (LCD) roof.
My logic is thus: Coupes use the roof as part of the structure of the car and therefore transmit stresses through it. Convertibles have to be able to perform without any stress being passed through the roof (when it's not there) so increase body strength in other areas. Ergo even when the roof is up, any stresses through it are lower than the coupe.
I doubt this glass (being LCD) is as tough as a normal panoramic roof and may not be able to survive the stresses required for the coupe.
Or I could just be making it up as I go along