I personally would rather it not apply globally, the point of Admins is supposed to be you can override anything and this would make it impossible to override this specific thing. Unless you add a way to get around that, which just seems like a lot more work than leaving it as is.
I mean Admins can post in closed topics just like they’re normal topics, and that’s obviously intended. It’s completely normal behavior for them not to be constrained by anything they put on the site IMO