I write, as ever, as a mere civvy and SLF. Oh! and a Queen's Scout! I certainly don't have a dog in the fight.
Nobody has yet commented on the likelihood that scarcely any member of the public these days has any idea of any of the three rank structures, and is virtually unimpressible by anything short of a knighthood..
My little village has several retired senior officers, some very senior retired police officers, and a knight of the realm ......... none of them clinging to any sort of entitlement, but happy to talk over a pint [remember talking over pints?] and learn of mutual friends, enemies and experiences, places served and journeys made.
I believe that clinging to military ranks {Retd] has had its day, except as courtesy addresses and third-party references. As for army captains retaining the rank title, that is surely risible.