80% wastage? You’ve obviously never seen rock being quarried. The tools and methods are much the same today as they’ve always been, saws, wedges, drills. Today the tools are powered but function as they have for thousands of years.
I live near active atone quarries, They cut huge blocks and do not waste 80% of the stone. Find a stone quarry, talk to the people doing the work as I have, take time to understand what they’re doing, maybe even watch the History channel and when you’ve learned something about the subject of stone quarrying, come back.
Further if you have ANY EVIDENCE of formed concrete-like material for the ancient Egyptians bring it forward instead of, well how does one describe your assertions?
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