If we’re nitpicking on the theme, it’s not immediately clear to me what the function of the colours is. Both “Community Announcements” and “Collaboration and Author Resources” are orange, while both “Authoring” and “TADS 2 and 3” are light green, and I don’t see the connection. Surely it’s not just for decoration?
But that’s a minor thing, and I’m sure it can be switched off. I’m much more worried about what tomasb wrote:
On the whole, I was starting to warm up to the idea of Discourse (mobile-friendly, less clutter, etc.), but those are some very loud warning bells.