You forget fighting one melee per mob so that you get the kill rather than all work together to bring enemies down faster and make it easier on the healer.
Also running through traps to ruin the trappers fun and cost some more sp from the healer.
Or insisting on high difficulties when the group isn't capable because who cares about the resources of the blue bars. We can do it!
I have met maybe two melees smart enough to stand in firewall, kite through bb, etc. the rest would rather die and have died than work with the aoe. Half the time they fight stuff out of cc than move one step over so the enemy is dancing and stops hitting them.
I suggest melee start thinking long and hard about their part of the teamwork equation. Because I started soloing my wizard and arti and FvS not because I could, but because it was less stressful, less annoying and gave me fewer headaches.
No melees to raise half the map and kill none of it and throw in a dungeon alert as a poor untasted toon tries to chase after them. No melees refusing to use the aoe or cc and wasting my sp dying because heaven forbid anyone or anything else touches "their enemy". No more joining to do traps for the bonus and have to deal with already triggered traps that I cannot time anymore or heaven forbid disable and so lose the bonus xp... and staring at a soul stone in the middle of the trap and feeling sorry for the cleric.
No more zero fort and zero defense melees that cannot survive between two heals.
No more whining about buffs or hjeal me from across the map when they couldn't sit still to get the buffs with everyone else.
That's why I went back to solo or über tr groups who are self-reliant 100%. Not because it's easier, but because it's less annoying.
I have met a few people who actually cooperate and when they say teamwork, they mean from both sides. Most are nothing like that, they want others to support their play and fun but never the other way.