I'm guessing here, but I can imagine he has the same concern that many would make aircraft/tanks a bright color (particularly for the AvA, scenarios, FSOs) to make them easier to spot. Remember, this is the same community which uses mouse icons as a gunsight.
I'm not sure how the game identifies skins, but I think it would work best if a player cannot be seen in a skin which he has not bothered to download and install. The principle must be maintained that either you see the other players in the skin they have selected for themselves, or you see them in the default skin. I'm not sure if the game is capable of this though if the players are given the ability to create their own .res files.
Or, even further off the track: I was talking to my high schooler the other day about the relative importance of in-game player content creation (e.g. picking your helmet, uniform color, patches, etc in Halo). He thinks that feature is critical. Then I started imagining how it might be implemented in AH. Take for example the P-51D - you go to the hangar, pick a base skin configuration - either natural metal, OD over light grey, or OD on upper surfaces only. Then choose your FG/sqaudron - and the correct color scheme and fuselage ID letters are applied. Then chose your relative level of weathering, dirt/grime, and scratches/paintwear. Finally, choose the aircraft name/noseart from a supplied list- or supply your own through a file layer upload not unlike the squad art .bmp.
I wonder if skins implemented like that would get around the size/space constraints of the skin system? Maybe it would be 10 times worse! Certainly though it would give the players a lot more to do in the hangar, and personalize the game quite a bit more...