In the winter when it's cold, They add a layer of warmth
I've been known to pick up a hoof and trim it while on a ride. Gives me some protection
Sometimes when we are riding in tourist destination, (like Bryce Canyon or Yellowstone) It is as much fun to get dressed up like a cowboy for the attention all the tourist give you. I'm sure there are more photos of me on coffee tables in Europe that I'll ever have for myself.
We just find chinks more comfortable for most of the year and wear the shotguns only during the colder weather..
I can't think of anybody wearing batwings for trail rides. That style is more for the rodeo work.
When I did Enurance races, I wear the half chaps to protect the inner calf from rubbing and getting sore.
Look at what ridding you are doing, and have fun with them. I enjoy mine.