[toni-a]

Hi toni
sometime  I'm surprised from your questions. I know you well. You are telented photographer , times ago I have learned from you photography - 14..16years ago. At that time you organized photo parties - Marcus and Klaus ware active too, the new internet stars  Brightcolors and JJ_so ware with zero posts here.
Taking a good exposure and getting the right WB is something basics, and I cannot imagine that you did not know it

Hi Miro
it's about 2 situations: first the basics you are right: getting exposure and white balance correct, that's very important if you have many pictures, however most flaws here can be easily and rapidly corrected when shooting RAW
second situation which is the initial discussion is how accurate the colors are when white balance and exposure are correct.
 Take the same pictures with two different cameras, even if you set same white balance and exposure you will have slightly different colors
here's an example they shot a color chart with panasonic G9, to the left G9 colors to the right reference color. as you can see colors are not 100% accurate however believe me if you see charts next to each other without corresponding colors juxtaposition you won't be able to tell the difference, so is it relevant for the end result, up to you to judge