I think this is a great idea to keep !experienced_devs for the experienced devs while still having a good place for less experienced devs to ask questions. I really liked the policy on /r/experienced_devs not allowing less experienced devs from posting.
I'm sorry for hijacking your comment (eh), but for anyone who's a Canadian, I started an r/cscareerquestionsCAD equivalent over on lemmy.ca as I felt it was the most appropriate place to put a region specific community.