Of course gamegetters work pretty dang good. If they didn’t, they wouldn’t have been manufactured for so long. Noone’s claiming otherwise. They simply are not as durable as XX75’s, which are not as durable as XX78’s…that’s all.
As far as I know, aluminum arrows are straighter simply because the manufacturing process for them is more refined when compared to that of carbon arrows. It’s merely academic though since we can’t shoot good enough to perceive the difference.