Every modeler must make decisions on the extent of the work to be included in his or her model and that includes paint and color research. Whether you wish to call the color right or appropriate is immaterial. What is material to an accurate representation is being in the at the very least the right basic shades. While you may feel that an airplane painted in precisely matched paints will not look like the prototype many people will differ with you.
One of the great things that the Internet has brought to us over the past ten years or so is sources for the correct information. For some of us it is gratifying to have that information and use it. I build both 700 and 350 scale ships as well as armor. I have in the past been ignorant of the right colors to use on my models and diminished them in the use of what amounted to a totally inaccurate palette.
I have had my training in history, government and the law and can appreciate the value of accurate information. I also appreciate the satisfaction of using that information. When people view my ship models one of the first things the average person will say is that they thought all warships were gray. It helps to make their appreciation of the era and the people portrayed in the model more vibrant and more relevant to the observer to make it right.
This is not to say that there is no room for weathering and usage. I have seen brilliant models portraying hard use and long times at sea away from the hands of the shipyard. They do all start with the right color, and there is a right color, the color they were painted at the time. Obviously, a modeler who wishes to weather a model will use analysis, interpretation and judgment to create the effect wanted. Taste, however, can give us purple Arizonas.
While you may not accept that a modeler must start with a particular color for the proper effect it hardly makes a model accurate if the camouflage scheme should be done in purple blue based colors and is instead done in neutral based colors no matter how much analysis, interpretation and judgment is used. Yes it may be a great paint job, a virtual tour de force of artistry, but it won't be accurate. The work that I have seen of some of the truly great ship modelers starts with accurate colors. They may weather them, fade them or in other ways manipulate them but they start with the right ones.
As much as I may like the work of some of the truly gifted artists out there who build ship models that are weathered and faded, put in seascapes with hand painted backgrounds and are so good as to be breathtaking (just take a look at the galleries in Modelwarships.com and take in Kostas Katseas and Jim Baumann's work), I prefer to use the colors in their original formats. That is not to say that I have not built models that have experimented with scale and atmospheric effects, it just expresses a preference.