I think that some of you are thinking purely about proper ATC, where the traffic is controlled. At an uncontrolled field (FISO or A/G) or farm strip, "blue biplane CD" tells every other pilot in the vicinity that you're in a blue biplane. G-CD tells everyone you're in a G-registered aircraft. Could be an aeroplane, helicopter, balloon, flexwing, motor glider, airship, microlight, autogyro........Will the naysayers accept this not un-trivial point? Otherwise we're just going round in circles. It is also possible that you cannot see the advantages because you have never operated in a very busy, uncontrolled environment.
The busy uncontrolled airspace I fly in is full of white SkyRangers, C42's, Cessna's, so good luck telling the difference - and as for anybody knowing their Archers from their Warriors from their Dakota's...