Keep in mind it isn't the absolute number of ITT km that matters, but the ratio of that to MTF km. A TDF with 70-80 km of ITT can still be favorable to pure climbers if there are numerous long climbs. The time they lose in the chronos they can gain back in the climbs. While the climbers did not face a lot of TT this year, they also did not have a lot of stages where they could take full advantage of their specialty.
Of course a rider who is elite at both disciplines is still going to be favored. What having relatively few TT and climbing km mostly does, as seen this year, is reduce the gaps between riders. The smaller the gaps, the greater the possibility of a chance or unusual event--a split in a flat stage, a descent, et al.--determining the outcome. If you want to maximize the possibility that the strongest overall rider will win, you have many stages where gaps are made.