Yeah, it really shows what an open goal they missed this year. Fastest or second fastest car for every race bar 2.
It does, and it doesn't, its essentially useless as fastest lap means quantatively... nothing at all.
Button has put in a few fastest laps at the end of the race, when anywhere from 3rd to 15th, because he has something to prove, while the guys at the front with a 2 second lead don't push on the final lap because a mistake will cost them a win. Second last race of the season was it, Vettel did a fastest lap on the last lap(button may then have beaten it, can't recall), Vettel was second with a huge gap, he could spin, miss a corner, come back on and finish 2nd, Hamilton could make one mistake and lose the win.
Fastest lap usually depended on who was where in the last couple laps, can lose it all... safe and steady, nothing to lose, hell for leather.
Look at the numbers, at races where Red Bull struggled in quali, and struggled throughout a race, they still often go top 2 fastest lap, when the car over race distance and qualifying was NOT the second fastest car.
Low fuel, that Red Bull was immense all season even when the car struggled in race and in qualifying, that car could still put in a fastest lap... though again, Red Bull languishing in a 4th-8th finish had less to lose and Vettel likes peeing around with fastest lap, but it also shows the car on low fuel was capable of those speeds, and how that means nothing for race pace at all.
You also have guys who had a problem pitted late and had stupid fresh tyres at the end and could easily post a fastest lap compared to those not doing it(that really mostly messed up everyone below Mclaren/Red bull as they have both the driver and most of the season the car that it didn't matter.
Say a Force India gets an issue, pits gets fresh softs and goes from 8th fastest to 3rd fastest at race X.
Mclaren had a very good car, most of the season, and a crap team to back it and put it into wins, fastest laps doesn't have any bearing on that though.