If you're up against any sort of 'blender' build it can mean the difference between survival and a frustrating death to the canyon floor (or whatever map you happen to be on). Sometimes all it takes is buying some time, be it for your ally, your engies, or your gunners, to get you out of it. Personally, I view it as a 'trust' tool: You're using it and putting your faith in your crew and your ally to get you out of the situation.