It might turn out that for all or most micronutrients there is no advantage at all in consuming more than a certain minimum requirement, and hence that the "optimal" amount of minerals is anything between the daily minimum and a toxic dose.
If that were the case then it would not be bizarre at all if it turned out that most people in the developed world were getting an optimal amount of minerals, given that our dietary staples are fortified with micronutrients for the specific purpose of preventing micronutrient deficiency and that micronutrient deficiency as a public health issue is something we've been aware of and working to reduce for quite a while now. If you eat breakfast cereal with milk in the morning and a sandwich made from commercially-sold bread and meat for lunch I suspect you would have to try very hard to develop any micronutrient deficiency.
It would be a lot more interesting if there was some sort of dose/effect curve for these micronutrients where we could find all the maximum values and hit them, as opposed to a boring dose/effect plateau, but just because it would be interesting doesn't make it true.
If you eat breakfast cereal with milk in the morning and a sandwich made from commercially-sold bread and meat for lunch I suspect you would have to try very hard to develop any micronutrient deficiency.
I didn't research it for more than five minutes, but I suspect someone on such a diet could easily develop a vitamin K deficiency. The DRI for males/females is 120/90 mcg/day, and I found no breakfast cereal, milk or bread that had anything close to that. There are too many lunchmeats to check, but the highest values I saw were in the 3 mcg / 28 oz range.