Let's not oversimplify evolutionary theory. This is an unguided process without an end goal in mind. What works for one may not work for another. True, in some species a "win" is obtained by being bigger, faster, stronger but for another it might be success through cooperation (inter-species or intra-species).Evolution...We attend/aspire to the most likely to survive...and that is usually the one who is the 'most'.
...bleeds into other things that do not relate to survival...and that even might negatively impact survival.
Contrary to popular opinion, mankind has not evolved for accurate discrimination....but for reproductive dominance/basic survival.
Evolution is not a toughest guy/last man standing competition. It's about being optimally adapted to your environment. That can mean a lot of different things.
Finally, one could easily argue that, for humans, "accurate discrimination" aids in basic survival which leads to "reproductive dominance" (unless by "dominance" you're referring to power/strength but in that case it's only proper to point out that humans are not particularly sexually dimorphic so it's less important to begin with).