I don't think you can be sure you're breaking up agglomerations, and proper pigment wetting, without milling or the use of dispersants.
Other than potential issues with settling being faster than it should in the wells of a palette for example, this will lead to problems with regard to shelf life.
This is much more difficult than I think you're giving it credit - it's notorious for being harder to control in practice than on paper.
Two batches of a pigment from one supplier can vary, leading to very different colouring abilities in a mix even with 'the same' pigment. In addition to how this affects consistency it's a major headache when it comes to using guides to how A+B+C=D.
On top of that, with a relatively limited palette I think you'll run into gamut issues, e.g. with CMY you have major gaps in the violet, orange/red and even in the green where the chroma is highest.
Einion
I apologize Einion, but it you seem to not give me enough Credit. I have done all the research and i know all the problems you have been presenting me with. And i have come up with some solutions to some of the problems.
Going back to the dispersant thing, It is possible, with oxides(which is mostly what i'm using) to just pre-disperse them in water, and they will come out just as good as if you've used dispersant. Dispersant was created for the trickier pigment. Granted, not all pigments act the same way, and some oxides do need some extra attention. I will be mulling all the pigments by hand into the water for predispersal. I will be mulling all the pigments by hand into the binder. This way i can control exactly how the paint turns out. Yes you could achieve the same, if not better result with a machine. However i want to do this by hand(personal Preference) I will have dispersant on the side, in case i need to use it. Some pigments, as said earlier, are trickier to disperse.
The settling issue deals with binder not dispersant. If the pigment isn't "ground" into the binder correctly it will seperate.
Onto the colour mixing:
I have spent the last few months, literally just mixing paint. This was to hone my skill at being able to do this. Personally i enjoy it. I have gained alot of knowledge through testing and trial and error. Also, to make things simpler, you can always buy a Mixing Chart. This will help with basic stuff. I believe you can find a couple of them at dickblick.com if i'm not mistaken.
Now with all that said, I know you are just trying to give constructive criticism and pointing out flaws. And i understand and appreciate it.
Cheers. Gary.