Of course, many filmmakers that would disagree with that assessment. Hitchcock chief among them; he viewed cutting as a valuable tool, and saw his experimentation with long takes in Rope and Under Capricorn as failures that didn't take advantage of the medium.
And still, it was a great achievement of all of the involved. It takes quite a lot of talent and effort to get 10 minute long takes done, and even more to make seamless transitions between several of those 10 minute takes. There are many out there who wouldn't manage to do that.