Cloned out is an interesting way to view it. For me, I'm dwindling in interest in the newer movies' figures to some degree. I think they're neat but the cynic in me can't help but think the marketing department somewhere didn't play a hand in the decision for all the variations in ROTS.
Prequel trilogy managed to have stormtroopers, snowtroopers and scout troopers. All largely white, variations based on need for a particular environment or need for a type of gear. There were Royal Guards as well. All uniform, all military and not particularly colorful.
Clones didn't show up until AOTC (go figure) and we had white clones, with some color added as rank designations. Kind of logical in some respects, though I think the subtlety of classic rank insignia on military uniforms of the real world are preferable and probably less target inducing than bright red, blue or yellow markings distinguishing a leader from the grunts. But whatever, it's not reality.
ROTS brought us the rainbow and all the colors it makes possible. I'm ok with the deco on Kashyyk (spelling, sorry) it kinda made sense. But what world required purple clones? Not saying they look bad, not saying I don't own them, but why? Did different regiments in WWII have different uniforms or were they simply different battalions, armies or whatever? Dunno, but I can't help but think someone at Lucasfilm was meeting with the marketing folks and saying no, we'll give the commanders or whatever different helmets AND we'll give the different units different color markings. THAT!!1! will give us a tool for marketing. No easy customs, lots of variety AND hey, hey, this is cool...let's make two different sculpts, one basic, one SA and the geeks will clamour for both versions. Yeah, that's the ticket.