I'm a purist Umut, if it was originally French polished then that's what it gets on restoration In practice it's as resilient as polyurethabe or cellulose based paints, they all scratch. I don't remember scratching my violin when I used to play one
My older plate cameras, 2½ Houghtons, were french polished and there was little wear the polish was intact despite some minor knocks etc over the preceeding century.
Since I made the original post I've almost finished french polishing another 5 Thornton Pickard (or similar) shutters (well the wooden cases) and spare lens plates and the Blonde Shellac is a nicer finish. I can use a coat or two of the darker shellac when I need to get a better colour match.