Correct me if I am wrong, but isn't "decisive moment" term which describe that photographer press shutter on his/hers camera at moment when all parts which will make that photograph (light, composition, etc.) are, by photographers opinion, there and such as they should be. So, what is difference if at that moment pressed shutter is on Graflex, Leica, Canon, Mamiya... camera. I mean, pressing shutter at 10fps camera and hoping that atleast one of photographs will be "that" photograph is not "decisive moment" photography. As I understand "decisive moment" photography is to press shutter only once but at right time, that is at decisive moment (moment of decision when to press shutter). And shutter can be pressed once at right time on autoeverything 10fps 35mm SLR same as on MF or all manual slow shooting LF format camera.
Regards