i don't know very much about the unification timeline in those countries or about the corresponding articles i do know that leti would have described himself as milanese when in france britain or amsterdam and not as italian i acknowledge that there is a lot of anachronism on wikipedia but have the naieve hope that it can be avoided at least in the articles that i work on and will eventually be fixed elsewhere i feel like most people on the english wikipedia know that milan is in italy so we aren't doing them a diservice by being more specific in short just because other articles are less precise in their style is no reason to perpetuate that style also i am not entirely sure that the situation is as dire as you describe it in other areas for example most residents of burgundy are refered to as burgundian rather than french