Robert Temple, in his book, ‘Egyptian Dawn’, makes the point many times that knowledge of Ancient Egypt is in a mess with many experts disagreeing the who what where when of it and that so called experts of Egyptology are not really so expert at all as they have very little interconnecting knowledge of other disciplines with which they state very ignorant notions of what really happened in ancient Egypt, by who, when and how. I guess they are doing their best, but I can see how Temple may have a point.
Interconnected Knowledge Required for the Study of Ancient Egypt