The primary question is one of purpose: someone in a support role is hired to keep me effective and productive, and evaluated on their ability to do so. I am their customer. If I win, they win.
The goal of IT isn't good systems architecture or innovation -- it's me. Supporting me well often requires good systems architecture and innovation. It also requires compromising those at times to my goals, having clean transition strategies, and similar choices as well. Those decisions are made based on their impact on me.
I absolutely think you are wrong that innovating is derived from your needs, a technology group driving innovation could just as well include obsoleting you. An IT department can bring new business ideas to a leadership team, and arguably their leader is a part of that leadership team, at least until every c-suite person is tech savvy enough to obsolete the CIO position.
All of those things are there to support the business, not the other way around.