In the abstract, what is meant by 'raid utility'?

If it's just damage buffs or ways of increasing damage in the team, and if the calculated buffs aren't enough for the overall team to go above four 'non utility' damagers, then this 'utility' might as well not be there (especially as in the abstract the 'utility' has other players and possibly timing coordination as dependencies, while 'non utility' only needs to manage themselves).

Is it at that point?