Whole grains are great and very healthy, and a high-carb diet rich in whole grains and with an appropriate level of calories will be great.
On the other hand, while a ketogenic diet is great for weight control and cardiovascular health, they're probably much worse for your kidneys.
In the US, kidney issues are a problem, but cardiovascular health are a much bigger problem. Perhaps more importantly, people who don't do keto/high-protein usually aren't on a perfect veggie-rich, whole grain diet instead. They're on a diet of refined carbs and excessive calories.
If you're really committed to a super-healthy diet, you should probably eat lots of carbs, but the right carbs--complex and mixed with fiber. If you're an average American who doesn't feel like a diet of veggies and whole grains, high-protein is probably a good route to take. I tend to go high protein (even as a vegetarian) because I enjoy the taste and it fills me up better than many others things I like. It fits my health vs. food enjoyment balance in a way I have the will-power to maintain.
In short, complex carbs are great, but don't make perfect the enemy of the good, and don't set yourself up for failure.