Hmmm?
I could make loads of use with that order.
Instead of having to use generic shift-p, 3 or shift-p 2-* or shift-p 1*, instead of using c31, or shift-e 3.
I'll tell you what the two pointless orders that get AI killed are;
Shift-c, 3, Shift-w, 3.
Unless they're used very specifically.
Most AI orders carry that risk, in fact, as any AI already engaged wont finish their fight if the player orders them to do something else, which means they'll just fly to their next objective.
Just because you can't think of a situation where you could implement it doesn't mean other people can't, and isn't a reason to skip it's inclusion.