Yea, I know what you mean.
Diet, to me, is just the same as lifestyle.
I don't view a diet as temporary. I have a current diet, this would be a modification of my current diet, which is currently set up to avoid high iron, which would have to continue.
It is well understood that basic meat, fruit, nuts, and vegetables are part of a healthy diet in the first place, well geared towards foods that are easily digested and have what the body requires without excess empty calories.
I don't really see the importance of living a lifestyle like a caveman, but rather getting the body what it needs to be optimal.
I like simple, I don't want to be running calculations and statistics for every thing I look at, I just want to go into a store, know what to buy, and be out.
This seems like a pretty good balance of optimization and simplicity.