I'd have thought they needed accurate data even more. Especially given the much vaunted pursuit of marginal gains.
But it is very well priced, light, and a piece of piss to install. If they did anything in a 165mm, preferably a Rotor. I would have jumped on it I reckon. Although the P2M is not that much more expensive.
http://www.cyclepowermeters.com/stages-shimano-105-57005750-2310-p.asp
Nope nothing in 165....
Insert troll face