I would have to agree with many of the comments here, particularly Michael Valentine Jones', as decades on and I still get involved in creating enterprise systems from department cobbled ones e.g. their use of Excel, Access or even far more professional attempts.

In the end, if a system is mission critical to a company or nearly that important then the nonfunctional aspects that the IT department brings (redundancy, disaster recovery, etc.) are essential and something that departments rarely implement to that satisfaction of the board.