No? I think you can. I think it's quite possible to navigate well without being musical, or be musical without navigating well.I'm glad you wrote that. But keep in mind that the current subtopic is dictatorship in musical lead-following! You can't simply separate navigation from musicality.
I think you're quite right that combining the two is the ultimate goal. And it is your nature to set high standards, so I understand why you would find it unacceptable to separate them. But they are, in fact, separable!