djoser's pyramid has cedar beams that still support the roof of an inner chamber, truely massive, and at something like 4000 years old are past waranty, making the few that have failed free of liability concerns, but
less than 100 years later the eygyptians had shifted to all stone roofs for inner chambers in there built to last projects.
The techniques and tools were used for millenia prior to the construction of the pyramids, and have been in continious use and production from those times till now.
It remind me of the quote from Blaise Pascale:
"I would have written a shorter letter, but I did not have the time."
— source: https://www.npr.org/sections/13.7/2014/02/03/270680304/this-...
The idea that you need expertise and experience to produce something efficient and refined that fit perfectly the need that it fulfills.