Bingowings said:

The TIE pilots and AT-AT drivers followed the same trooper template.

The Clone Wars took place (on screen) across a wider variety of environments so it sort of made sense that their armour would have more variety to it but if they had camouflage during the Clone Wars it makes sense that they would do the same on Endor (the Rebel troops did but as I mentioned earlier there is the nonsense of dragging a big shiny gold robot and a bleeping white barrel of christmas lights to the same party).

So either someone has to make ROTJ make visual sense or tone down the colour variation in the PT.

I don't hate the armor variations at all, I just hate some of the coloring. Like the green visor on the Kashyyk commander, or the purple snow troopers(PURPLE?! WHAT?!) I'm all for the Utapau, and Coruscant troopers being orange, and red, and blue and whatnot.