If you review the articles on this web site that deal with shoulder health, there's much discussion on balancing scapular elevation, retraction, and depression.
However, none of the scap depression exercise lists include pull-ups or chin-ups. Seems to me there's quite a bit of this action in the movement, particularly at the top.
Does anyone know why the chin-up gets no love in this department? I get that they preferentially recruit the lats, but it seems to me the lower traps would get hit just as hard. If chin-ups are a staple in your programming, is there really any need for a healthy individual to target the lower traps with prone trap raises, face pulls, wall slides, etc?