few things that come to mind after watching that. I do not debate, working stone with harder or same stone makes said stone workable in some sense. But you have singled out one aspect of the entirety of what makes egypt mind boggling, its that multi ton granite pieces are shaped with not only angular precision, but geometrically symmetrical precision in some cases so precise we can not duplicate it with modern-computer controlled machines.. and all these pieces (other than the broken sarcophagus in cairo museum that has the SAW marks, and others) are just supposed to be believed they were made with no human error-when using the "rock smash" technique? this lady predicted it would take her at least 7 months to complete one vase in diorite, there were thousands of them found in . is the vase she producing so symmetrically precise it blows engineers minds? from the link you posted, her diorite pieces are far from the precision even the egyptians had in theirs, and nowhere as complicated, notice how she actually has no diorite vase? because she probrably couldn't figure it out either how they were able to hollow the inside out of a diorite piece from a 2 inch hole on the top, with all edges of the vase having the exact same thickness of the vases form (we know "Egyptians" accomplished this because they measured the thickness from a broken diorite vase). its much bigger than pieces that can be produced in this method when compared to the pieces they made thousands of years ago. and thats not even touching on their ability to astrologically postiion their structures, as well as how they managed to detect ley lines so they could line the structures on them, or knowing the electrical properties of quartz or what electricity was-and we know, but wont accept it academically, that they knew about it from the sand they are finding in the voids of the great pyramid-its not the same sand found on the giza plateau-it was imported from hundreds of miles away just for "filler" because that particular sand had a quartz content that made it a better conductor than the sands of giza, and the Baghdad battery. and what impresses me the most is their understanding of complex math to make all of egypt even possible. and SO much more.

also while its on my mind I want to go back to the human error aspect. take the box in this video I posted in this thread-and on that box we will take the inside into context. while they were using a flint and stone hammer tecnique, if they went even 10000th of an inch too deep on ONE swing, they would have to turn around and rework the entire surface they had just got done doing to get it to the NEW depth. compound that to the entirety of production, and there would be no way they could have, for example, built the great pyramid in 20 years, as modern Egyptology says.