Yes.2018 is a good example of the opposite. It was a controlled pace, and they even waited after Nibali crashed and broke his back. In the end, he finished only 13'' behind Thomas. The day before on an easier MTF, Thomas dropped him by nearly a minute.
Quintana was full gas on Alpe d'Huez, Sastre likewise. Vingegaard and Pogi could have done it faster last year.
Ideal pacing strategies do not have a big group for very long, especially not on climbs like the Alpe where the hardest section is in the beginning.