Interesting take on it by Sarah Crouch who says that the women should run 10k like the men-
Personally, I think it would make more sense to move the men down to 6k. Or put men and women both at 8k. By running a shorter distance you open it up to more middle distance runners, which creates more opportunities for athletes. It's a good deal for the women to run 6k now and they should shorten the distance for men so that you give more 800 or 1500 men who could run CC.
Anyway, at some point, the idea that men's and women's events should be the same breaks down. The 100H/110H are different, hurdle and barrier heights are different in the hurdles and SC, and the field implements don't weigh the same for men and women. These are mostly practical accommodations to the fact that the average women is smaller than the average man. It doesn't make the events "unequal."