It’s perfectly reasonable to renovate a historical building, following appropriate techniques, so that it can be appreciated as it was during its time. Greek ruins would be less compelling without the extensive restoration work.
But then we get things like the Grand Gallery Big Step [0] which was restored to a perfect right angle [1] without any evidence that was the original or correct shape. Leading to diagrams like this[2] which no longer show that surface may have been angled like the rest of the Grand Gallery.