i'll say this once:

modern road bikes with short chainstays are not suited to triples.

there.

the sort chain length means that the chainline has to traverse too wide an angle to get crisp shifting on a triple. this is not the case with mtbs and touring bikes with longer stays. moreover, mtb chainrings are smaller than road chainrings, so the rear derailleur has to throw less chain.

use a triple if you like, but you will never shift as crisply as with a double. a compact crankset gives you moust of the low gears you'll need to climb everything but walls, with a better chainline and less chain than a triple. if you need something lower than 34x25 or 34x27, then you're moving at about 10 km/h and every kid on a trike will be passing you.

if you need a triple, go for it. live with the sloppy shifting and don't complain when your lbs wrench can't make it better.