It doesn't take up room, and for that one time you need to crimp some large wire or cable, you'll have it I don't have it in front of me now, but I think just below it is a smaller "regular" crimper.
The last thing you want when you are having one of those "red wire, blue wire" moments is having to think oh crap, did I get the tool with the crimper or not?Better safe than sorry I suppose! ;DDef