Yes, it is what our ancestors ate for about 10,000 years back.
And whole grains are more filling and they spike our blood sugar less.
But we had ancestors for hundreds of thousands of years before that who did not eat grains, and the argument against whole grains now, whether right or wrong, is described in the link I offered above.
There doesn’t appear to be any harm if the whole grains are eaten sparingly-I only bake in the winter, and the bread is a slice now and then treat, since I barter much of it for the fresh eggs, chicken and other meat I like more.