That is an absurd take. For all fields, most people are on the outside. Historical work for most people - produced by those on the outside - is how our society and culture understands itself.

I recently finished an excellent one volume history of the Civil War, "Battle Cry of Freedom." It was written by James McPherson, a historian. This book has informed my understanding of not just the Civil War, but also the lead up to it. I believe this context is essential for understanding where we are now.