On many stone structures the marks left by rotary drills and such can be seen. And some surfaces are flat to within 2 thousands of an inch. Impossible with hand tools. These things are as flat as modern truing tables. No way could they be produced by craftsmen with chisels.
That’s not impossible with hand tools. It’s done today hand tools. The only limit on smoothness, leveling or any other measure of quality is patience. Is the person doing the work doing it right? If the answer is yes they can do it with anything. Sure a little easier with modern conveniences, but not always. You just can’t replace the feel of skilled hands.