Hang on. I think you're missing the point. It's not about how "if you've read one, you've read them all". The fact that MacBeth is another way to tell the Futile Struggle Against Fate story doesn't in any way diminish the creativity or power or uniqueness of the work. The point is that if it's not an archetypical story it won't resonate with the human mind, and the writer will fail.

We tell the same stories again and again because there's a finite set of stories that engage our mind, whether we like it or not.