I think a balance needs to be struck between threads that directly pertain to the core mission of SDN and threads that may help to bring senior people into the fold and keep them interested.
A practicing neurologist has a lot to offer students and residents, but if every thread is about what book to read for an MS4 neurology rotation and/or whether to rank categorical programs over advanced, then they are not going to stick around.
Some of the healthiest forums on this site, like anesthesia and pain, have a highly variegated collection of threads, ranging from cars to vacation spots to moving tips to clinical questions/advice threads. As a result, there is a large community of practicing physicians there who know each other well, and keep coming back year after year.
I'm not saying we have to be like that, but being open to seeing a few threads here and there that don't directly pertain to your needs would, in my opinion, be constructive to our ecosystem.