I personally find this to be true, however. I get much less help out of box squats than I would any other kind of full-ROM squat. I know there are loads of guys who swear by box squats, but most of them happen to be westsiders and/or currently using lifting gear. I don't think any of the current raw squatters use the box as one of their movements (Green, CWS, Lilliebridge, Andrey).
For a bodybuilder, wouldn't you also suggest full-ROM or quad-dominant squatting movements? If so, the box squat probably wouldn't come to mind as a first or second choice.
So I don't disagree with you, exactly, but box squatting is more situational when you think about its appropriateness.