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Maximum braking forces will be exerted when braking on pavement and most mechanical brakes will not be powerfull enough to lock the wheel. Atleast the ones I've tried.

I have cheap tektro jobbies on a fecking heavy cargo bike, running 2.5" hookworms. I can lock the front on the road fine. Although I do have a beefy 203mm disc.

Its a good point though. The point of traction loss on a cx bike is probably a lot less than a MTB with far fatter, and knobblier tyres. So there's lees force at the point of wheel lock.

This style of front hub/drop-out looks like a neater, if massively over-built for the use, solution to me.