@Koikoi It's always been a problem in MMoRPG's where party structures have fallen apart, people see the speed from the Damage Dealers in a group and think that it is purely attributed to the strength of character + Gear + Skills... So they replace classes that offer the debuffs and buffs in the groups quickly... Then their efficiency falls through the floor, the loots don't drop as fast, the experience and dungeons aren't raided as quickly and the bickering about who is at fault as fingers are pointed at WHO isn't carrying their weight more.
Meanwhile that support role they ousted from their party, which had buffed their speed & recovery ... And afflicted their prey with all kinds of heinous misfortunes has been snapped up by another group that takes them to even further heights.
There were many times, as a support role main player, that I wished I could join the mob team and just wipe the team who treated me as trash. But it was better satisfaction to watch their party disband in anger and take over their territory and loot spots instead. ^.^
Many of these mangaka's likely game and incorporate these social dynamics from that into their stories... It's a window onto the actions and behaviors of society in the real life at anyrate.