All valid points. However, the V-22 does not have access points that would allow unobstructed use of a mini-gun or .50 Cal on either side of the aircraft. The wing, engine nacelles, and proprotors are all obstructing potential external targets. And if a crew member using a mini-gun or .50 cal in the heat of battle hit one of those items, it would not be a good thing. If it works as claimed, the BAE system seems to be the best answer available based on the current design configuration where the intent is to use technology to overcome the lack of unobstructed gun port access.