Personally I like the idea. At least it seems worth trying it out, if it would promote elitism in the end we could just nuke the channels. If it does not then there's another place to discuss department specific topics.
I don't think #helpchat really takes care of everything the department text channel would take care of.
I see #helpchat really as a place where you can ask for help and such not really a place to discuss department specifics (SOP, RP, standards, optimization, etc.), tho that might be just me.
So for example, let's say someone wants to share in their optimal set up for xenobiology or they wanna share a pic of them getting stable EER 5000 engine. Where does it go? It really only fits #spacestation_13 but then if someone wants a feedback, their original message will get flooded with other topics really quickly.
In case we had department channels, someone could just post f.e. what they equip themselves as paramedic on #medical and prompt a conversation about optimal paramedic set-up. Sure it could go to #helpchat but personally I think it would fit department channel more. I imagine department text channels could be also used to discuss RP, standards, SOP etc.