OP writes: "Putting the debate itself aside, what we can see is that there are essentially 2 types of players : those who expect people to do their best, and those who don't care as content is cleared within the (generous) dungeon timer."

Your two types of player are actually more like 8 types of players, but we'll go with two for now.

The first type is much more interesting. These are what I consider the true semi-professional gamers --- those who see the game as a contest pitting their own skills against the game. Anything less than "the best" reduces their own value in this contest. They have a point.

Unfortunately, with great skill comes great temptation to let players who are not at their best know it. In. no. uncertain. terms.

Being great at playing a video games does not necessarily equate to having great people skills.

When that happens, the term "jerk" is sometimes appropriate.