I think it sucks!
In fact any new campsite the park service will make in the future will suck. I'm all about LNT and trying to minimize impact, but think they have gone too far.
All new sites are clear away from water sources so the nasty campers won't contaminate the stream. Are all off the trail so you don't ruin the experience of day hikers having to look at campers while walking the trail. The park hires some Penn State LNT guru guy to build all the new campsites. Heard of the soup Nazi, this guy is a LNT Nazi
A buddy who has hiked all the trails and is now working at staying at all the campsites in the park assures me all the new ones are like that.
21 is Ok except that there aren't many tent sites that are even somewhat flat. Getting water requires you drop through the steep stuff that I sure wouldn't want my children or wife to do. It's also a bit exposed to the wind. I was all siked up to stay there till I actually did
Does give you good access to LR and is an easy hike
Just get your water on your way in before you hike the last .3
Sorry if I sound so grumpy in my remarks