Originally Posted by
tomato coupe
Read the quote:
“The biggest thing is the weight factor because now you add 300-400 grams to the bike, so where are you going to lose that weight? Ultimately, you need to lose it on the frame or the wheels. That’s it, which means you need to get super light, once again pushing the boundaries there."
The cited issue is the extra weight of disc brakes, and having to lose that weight somewhere else on the bike. The situation would be the same with a dropper post - you'd have to lose the added weight somewhere else on the bike.
But even if the weights are the same, there is a big difference. You would only used the dropper post for races where it would help. Swapping it out is easy. Once on, the discs are always there.