I don't know how anyone comes to the conclusion that dynastic Egyptians couldn't do it, since they left behind paintings showing it being done, and obviously have a history of doing it.
I've never seen any depictions of dynastic Egyptians building megalithic structures. There are also no inscriptions showing them quarrying the megalithic blocks which comprise so many of their monuments.
Same goes for the transport of those blocks. I don't know of a single panel that shows them transporting a fifty ton block of solid granite, do you?
Speaking of granite, tell me what tools the dynastic Egyptians used to cut shape and smooth those multi-ton granite blocks to within a couple thousandths of a degree of perfect flatness? And then polish them to near mirror smoothness? With what tools?