Depends on who you think your competition is. Their biggest competition is Pog. The others are guys you'd expect if Vingegaard is fully healthy and ok, he takes minutes on in the mountains anyway. I would not care if I gain time on Remco, Roglic, CRod etc as I don't consider them a threat. I care about not losing time to Pog so not working with him on a stage like this that favours him massively is smart.
Considering the stage, working with Pog increases chances of Jorgensen getting tired but also because or the gravel, any mechanical incident is increased and you're distancing your other teammates so you could lose a ton to Pogacar if something goes wrong there.
There's minor benefits here but too high of a risk that you end up losing time to your main threat.