There's only one conclusive way to resolve this: bust out the nerf guns, designers vs devs, and may the best tribe win.
Or an even more violent idea, why not switch jobs for a week or two? Or be forced to combine forces on an unusually granular basis in a hackathon for an actually attractive prize package that happens to include the aforementioned nerf guns? Can be done incrementally.
Especially funny for engineering switching (or haplessly hackathon-ing) with support, or even better, switching with SAs/sales.
Anyway, best to approach it with a light heart, most specialties will, secretly or otherwise, have bombastic little expressions of esprits de corps, or self congratulations about they're the most important, but as long as it doesn't go too far (nor the reaction thereto devolve into hand-wringing sanctimony and Twitter videos) it can be fun.
Love your ideas! I proposed a hackathon but we had a company merge and reorg so it never happened :(.
I've personally attended conferences and classes related to design and UX. I learned a lot and it helped me to better communicate with the design team when we need to change aspects of the design.
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