The OP asked a question. It was answered with the official line. Some of you then went off on one with unsubstantiated theoretical stuff usually involving other engines/types. He wanted a simple answer!
Ah, but there in lies the true power of PPRune Technical Forum. It is not just a PM type one on one but a true discussion forum including drifting "off Topic" now and then and providing useful information to many more than just a single poster. Tis a shame that the thread got personalized, but if one reads beyond the personal coments there is much information and truly balance opinions within.
Typically the opening question is often open ended and subject to interpretation by the readers and responders, hence the broad viewpoints.