I think sensible supplementation is good.
The idea that simply eating real food is enough to provide the body with everything it needs is flawed. There are a couple of reasons:
1. Our food is not what it used to be. Mass produced, grown with chemicals, poor soil mineralization, etc. Even if you buy local organic produce, it is not as fresh and as good as its real, wild counterparts, and those are exceedingly hard to come by. Eating broccoli you bought at Whole Foods is not the same broccoli you would find in the wild and eat there and then.
2. The ratios of nutrients are artificial. Good or bad, but we live in a time when we can choose what we can eat, and how much of it. I can eat liver all day. I can eat 30 eggs. I have coconut oil, olive oil, and butter. Essentially, I am the one that decides what I eat. In the past, during Grok's time, this was not the case. You grew up and evolved in a particular place, and ate what that place offered, in the ratios that it provided. If you lived by the ocean, maybe you ate a higher ratio of fish. If you lived in the forest, maybe you ate more nuts and mushrooms. If you lived in a very warm climate, maybe you ate a lot more fruit.
The point is, you did not choose exactly what you ate and how much of it you ate, because your environment largely dictated that. Since we are now in charge of our diet, it is hard to imagine that what we are eating, despite our best intentions, provides us with the correct ratios of whatever our genes have adapted to. Primal is just a very rough approximation in a modern context, it is not Grok's diet.
3. Real food obtained in modern times does not magically provide us with the right "synergy" of nutrients. This is tied closely to point #2. We can get any real food in any quantity we want, and eat it with any frequency we want. I don't see how in the context of modern life, I can choose all my food and provide my body with everything it needs. How do you know you're getting everything you need, when you're picking food from a huge available supply, eating it in quantities not dictated by your natural environment, and when the food is not as good as it should be?
4. Supplementation is meant to supplement. This means that it adds to whatever you are eating, not replaces it. Supplementation is not advised as a replacement for real food. However, considering our diet is flawed, I don't see the harm in adding things you know your body needs.
5. Last by not least, optimal nutrition vs. adequate. Eating whole food might be adequate, but is it optimal? Supplements can help provide extra things you're missing, or not getting quite enough of. For example, having vitamin D level of 20ng/mL is sufficient for preventing bad vitamin D deficiency symptoms. However, is it optimal? You might be getting enough magnesium from your food, but are you getting the optimal amount? Same with all the other nutrients.