The national park authorities maintain the ones in this area to prevent damage. It’s good ?IMHAO, there is nothing wrong with preserving historical sites, especially when they've been there for centuries.
I get so tired of people who ruin trails & the like for their own selfish enjoyment. You can't believe the damage done to mountain trails on Boulder County property in the winters by people insisting on hiking or biking on muddy or snow-packed trails.