Any case book situation I've ever seen on this rule concerns the offense getting an advantage by intentionally stepping way off the floor (either to deceive the defense into "forgetting about them" or to avoid a violation like three in the key). Personally, I'm not going to call it unless the offense gained an advantage that they would have not otherwise got without going out of bounds. Even then, I'd be inclined to warn the first time.
That being the case, my main point is that this rule was not designed to prevent the defense from having a foot (or even more than just a foot) out of bounds. Using the sideline as an "additional defender" is good defense and should not be penalized.
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