I heard that the combined nozzle and reverser was a unique piece of aviation development.
The story I heard when I was an apprentice at Hurn was that, compared to the prototype multi finger nozzle and separate reverser, the production nozzle was:-
1. More efficient.
2. Lighter.
3. Simpler.
4. Cheaper to make and maintain.
I doubt there have been many developments that meet all 4 items.
Usually the first three can be met, but at great cost.
P.S. I did my bit of Concorde design in the FSDO by re-drawing a cabin bulkhead to reduce weight.