It isn't, it's just people seem to expect it to be some anarchic, chaotic, thrill fest, when it's the biggest race of the season, with all the best riders there and in form, and a lot of pressure on them to perform. That leads to risk free racing on the whole.
I wonder what might have been if Aru's break when Froome had a mechanical had somehow worked and stuck. Maybe it would have encouraged the others to challenge harder too and opened up the battle.
It isn't, it's just people seem to expect it to be some anarchic, chaotic, thrill fest, when it's the biggest race of the season, with all the best riders there and in form, and a lot of pressure on them to perform. That leads to risk free racing on the whole.