I think "accessible" was the important part of that comment. People with limited mobility may not have the privilege of having a pee outdoors; at least, not comfortably.

While I love to hike, including way off the beaten path, it's worth recognizing that not everyone is able-bodied enough to take advantage of those aspects of our parks. So, it's totally cool that National Parks provide a means for folks with limited mobility to safely see some of our nation's most beautiful places. And, it's a valid reason to visit the obvious parks rather than going off on your own in lonely places.