Actually, if ahsposo had said a distinct disadvantage of triples is the need for a new front derailleur and maybe a new left shifter, I would have to agree with that. But triples can go down to a 22T granny with an MTB chainset, which gives a far wider range and much lower set of gears than a compact could.
And my post to which he refers did say "decent hills"... highway overpasses and the odd 7% grade don't qualify. Whereas where I live, I have hills 360 degree around with quite a few 10% grades. And my home state in Australia, Tasmania, is just plain hilly.