I'll chime in.
I was there (didn't run cuz of an injury - had my best qualifying time ever too), but spoke to a fair number of runners. No PRs.
I heard one guy - 2:50ish guy - say the tailwind actually killed him. He didn't know if it was overstriding or what, but the wind definitely changed his gait ever so slightly and he got destroyed on the downhills. Boston does that anyway, but my sense is that for the non-elite, whatever the wind gave in giving a boost it took back at the end from muscle fatigue associated with whatever the wind did to adjust one's gait. The elite males had a great day, but that's because they are exceptional runners to begin with, take far fewer steps, and are out there for an hour less than the rest. Certainly an advantage to them.
So, for the non-elite, it seemed to be too much of a good thing. I guess a bit like making all those downhills just a tad steeper!