How to understand "one of utility"?

Having hard time wrapping my mind around "one of utility". For example:

The evaluation criterion used in this discourse is one of utility. Does the software serve a purpose?

Any help welcome

A Question Of Usefulness

A utility belt carries tools; a Sports Utility Vehicle is good for recreation or work. A question of utility is usually a question of whether something is a good practical tool, as opposed to a question about aesthetics, cost, or such. In this case, it means "a question of usefulness". The word utility could have been followed by a colon, as the question that follows is a summary of the actual evaluation criterion (standard the software is expected to meet).