Yeah, discs have been doing well... Nans Peters won yesterday on rim brakes, on a hilly stage with warp-speed descents. His teammates on AG2R also did well in the KOM category and made up time on the GC.
Today: another hilly one, and Podacar, another first-timer, won the stage on rim brakes. And who is now leading the GC? Roglic on rim brakes.
Discs seem to do much better on the pancake-flat stages, where the (rotating) weight penalty is not exposed. And where discs can continue to serve as a marketing vehicle aimed at flabby dentists with gold cards.