You are wrong and you are right at the same time.

Brakeless street riding looseness the crank bolts on pretty much any crank set up. When this happens to the DA 7710 it will cause the cranks to strip because play will develop if the bolts are lose. If you keep your crank bolts tight like you should do (by cranking them down every few days) you will have no problems. This by the way can happen on regular square taper cranks its just a hell of allot less common.

The second reason people strip their DA 7710 cranks is improper installation or I should say re-installation. Because the cranks come with self extracting bolts that let you get the cranks off with out a puller some people will put the cranks back on with the bolts still in. This makes it very difficult to align the BB splines with the crank arm and can result in tiny damage to the interface which you wont notice at first and will eventually develop in to a striped crank arm. The solution is simple just take out the self extracting bolts when you are putting the crank arm back on insuring perfect alignment.

These cranks are pretty much the **** by the way. They are super ****ing stiff and light. And I have had them on my work by for a while now with no problems. Austin (NACCC06 winner) rocks these on his brakeless track bike as well. These cranks also came stock on the bikes that Team Puma got. They had no problems. I see Carlos rocking these cranks on a new work bike now too and they are well over 2 years old at this point.