True in most cases - but, in some organizations, IT has ludicrous amounts of policy power that surpass what any rational person would think should be allocated to it.

In particular, Yahoo!'s IT organization kept Blackberry's as the Mobile Platform of choice, for a company whose major future growth is going to come from Mobile Consumer usage - far longer than it ever should have.

Eventually, though, somebody gets around to knocking heads, and IT typically falls in line...