Can you give examples of this “There are saw cuts and core drilling in these so precise that we can’t even reproduce them now with modern tools”
please?
Sure... There are a couple videos tucked away on Youtube that show it in detail and explain why it would be hard to replicate. I will have to go search them out again because it has been awhile since I watched them. But I am at the moment multitasking and in our forum server editing code to fix an issue. Later today I will try to get caught up and help with that. You are always welcome to go watch some of those videos over there. A couple are very good at explaining the exact differences and why. Cutting marks, speed rate, feed rate, sheer sizes of face cuts, Etc. Feats that we would have trouble replicating even now.
Tell you what impresses me most... The very oldest works like stone vessels were done on lathes with precision much better than the later works. And of a much harder stone than any later works. But they are lathed so precise that even now it would be extremely hard to do because they were somehow able to do this on material that had fractures. Yet they were able to do this without so much as chipping these fractures as the vessel was lathed. This would be hard to do now even with cracked wood let alone extremely hard stone.