MA/FPC/planet partner places per server or per area the parameters for ores/enmatter finds. So there are areas where you will never find some specific minerals that are very common on other areas.
But for the rest of the theories I agree: MA would be stupid to implement things like veigns, patterns etc.
Reason:
As soon as there is a logic behind it, sooner or later someone will find it and will make too much profit.
Example:
If you play roulette, it's made that the bank always wins (in the long run), no matter how you play. i think everybody agrees with me on that.
Still there are so many ppl in the world who play roulette "with a system" because they think, it increaes their chances.
So the best way is to make it randomly and just make the chances in a way that you (the company) win always in the long term. The more complex logic you implement, the higher are your costs, the higher are your risks and it doesn't increase your income... so why do it?