The integrated brake solution has a lot more downsides than it has upsides.

In a long time trial or triathlon, it makes a lot of sense to have more aerodynamic efficiency at the cost of performance or serviceability than it does on the road or in a pack of riders.

I would rather see a non-integrated brake fine-tuned to be more aero. (www.tririg.com) has a really neat brake they call the Omega that is super light as well as "aero." Other manufacturers have designs that attempt the same goal; TRP, Eggbrake, etc.