I think people generally doesn't use it cause they don't know about it. The other camera is default, and there's no tooltip saying what legacy camera is. I had someone asking me "but is it only avalaible to legacy players?". Many are also habitudinary, and since they always used normal one they don't wanna change. Me, I only wish I had changed to it earlier. And now I can finally autoface for attacking, my bard is very grateful, even if it's still weird how someones the character attacks while by graphics facing the oppsoite side :P