Originally Posted by Doge

I don't know where the ignorant comment comes from. Pros use what they are given.
The braking is fine with either and no TDF pro needs the 28mm+ tires you can use with a disc. They are still winning on 23-25mm tires.
The need to swap parts among GC teams is obvious.
The car is not always there and having 7 teammates that can give you their wheels (quickly) vs 1-2 that are setup your size to give you a bike should also be obvious.

Then there is less rotating weight, less fork weight and less cable/fluid weight. So even at equal mass the climbers would sometimes prefer to add lead to the frame than mass on the wheel, fork and cockpit (brake fluid reservoirs).

I have some 7-10 disc braked wheels and some 15-20 rim braked ones. Some of the disc brakes are not as good as some of the carbon rim brakes and visa versa.