You need fiber if you eat carbs. If you eat very little carbohydrates, you need very little fiber.
Almost everybody eats huge amounts of carbohydrates, and so would benefit from eating a proportional amount of fiber. They would also benefit from eating less carbohydrate.
It is stunning how stupid people can take true facts and ruin them.
Eat less, do more.
I don't think that's accurate.
A diet heavy in meat and protein still needs fiber to keep things moving.
I know this from personal experience.