As a layman I got the impression the issue was essentially settled with the AdS/CFT correspondence - string theory is equivalent to quantum field theory. Just

As a layman I got the impression the issue was essentially settled with the AdS/CFT correspondence - string theory is equivalent to quantum field theory. Just in the same way one can convert a boolean satisfiable problem into a graph coloring problem or a Sudoku puzzle or any other NP-complete problem. Different representations and ways of looking at the same thing. The details of the correspondence are currently only known for (toy) theories not describing the actual physics of our universe and it is a matter of debate whether it is possible to extend the correspondence to realistic models but nonetheless those are just two different ways of describing the same thing. I am not sure whether the correspondence has anything to say about what point of view is more fundamental - are both really equivalent or just in some limit, i.e. does string theory for example survive for very high energies while quantum field theory breaks down implying that there are really tiny strings while fields and particles are just a very good approximation?