There is always so many opinions on this. I know for myself if I don't do direct arm work I lose some muscle mass. I've done programs where I didn't do any direct arm work. Like with pull ups and chins I don't feel much if anything in my biceps. My reason is I concentrate on pulling straight down with my elbows and use my back(lats) to pull. I feel this makes the pull ups and chins stronger. Not saying that the biceps don't get some work but I don't feel it because I feel concentrating on the big back muscles is much better to keep me injury free.
Push ups and dips I feel mostly in the chest but I do feel some tricep work. I like a little extra arm work myself. What are Your opinions on this subject that Matt talks about.
Yeah I'm the guy that has to pull out all the stops just to keep any size. But I do like a little arm training whether or not my arms are big. I don't think a person that has been training for awhile can really add anymore size at an older age. But then again I could be wrong.