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But as far as know, the only person that can make this determination is the manufacturer.
So if that's your opinion you would ground an aircraft because of a piece of missing carpet (not in the MEL) while waiting for permission of the manufacturer
I brought up an acronym before NEF, it is used widely under FAA governance and would surprise me that every other CAA does not have guidelines for aircraft operaters to create a seperate lits of Non Essential for Flight items to be repaired or replaced usually before the next c check. NEF items are often AMM items. When not covered by the AMM or MEL a NEF item is generally approved for a non mel deferral by the operators maintenance controller. Are there not programs like this in the EU?
Education on this matter may help the OP from asking questions like this in the future.