I guess it depends on the horse but we don't do it for any horse at the barn I board at
Depending on if the horse usually has joint soreness. Otherwise just some splint boots are usually enough to suffice if you're worried. Otherwise they're horses they can handle it.
It depends on if the horse has the habits to get little injuries while working. Also, if he has a lot of space, you should put on wraps :)
It depends on the horse's behavior, if he's going to the paddock everyday, if he doesn't, yes, you should put on wraps.