You got a point that UX is more than UI. That is why we do more than UI
We have been part of defining all the Roles you may have heard of in our Role based applications. We work with marketing to define branding, we are a big part of the conference called Convergence where we have a lot of interaction with Customers and Partners. We are also part of the planning of new features, of gathering requirements etc.
Of course we do UI. That is what we spend most of our time on, because that is a pretty big part of what people experience
The the comments about Jakob's name, trust me, he gets that all the time. Funny thing is that both Jakob Nielsens are from the same university in Denmark.