I get more aroma from a 15 minute 170F whirlpool than the same hops at Flameout. If I add another addition at 120F I get even more aroma. But if I move the 120F to a 4 day dry hop at the end of fermentation I get even more aroma. There is not only a increase in hop aroma quantity at each difference, but also a slight change of character between them.
If I were brewing a hoppy beer and could only do a bittering charge at 60 and only one other addition, I would choose 15min at 170. But, obviously we can do whatever we want, so my favorite IPA method is 15min at 170, + 0min at 120, + dry hop.