The arrogance of some people

[Alahra]

But isn't having the goal of just clearing a dungeon such a mediocre and half hearted way of running?

It's important to remember that there are kind of two overarching player mentalities in games like this (and in games in general): there's a "game as sport" (let's say) mentality, that focuses on competition, honing skills, and one's betterment as a player; and then there is a sort of "game as leisure" mentality, which focuses more on a relaxed sort of enjoyment. Some players espouse both mentalities in varying sorts of content or based on varying moods. (I tend more toward sport on my main, NIN, which I use for progression, and leisure on my alt jobs, for instance.)

Neither way is necessarily more valid than the other—but for either side to expect the other to conform to what they enjoy is nearsighted and ultimately displays a lack of empathy and understanding.