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Quite.
Plus the speed on the climb is high enough for recent aero improvements to make a difference. It's not long ago that a deep carbon rim was a rarity on a mountain stage. Plus there's all the motorbikes giving riders a tow. I don't think anyone's measured that, but it could be a much bigger factor than we think. And there are shitloads of motorbikes near the dramas.
nick_h.
There's so many factors that impact on the time that it takes to do a climb that it's pointless comparing times from different editions. You've got to factor in all manor of weather conditions - temperature, air pressure, wind speed, humidity etc - then think about where the stage came in the race, i.e. first week, second week etc, plus the race situation, i.e. from a break, GC riders racing from the bottom and so on that you just can't compare.
That's before we even think about bike technology, improvements in nutrition and so on.