EQ1's content originally is due to spawn timer. If Emperor Ssraeshza respawned on Monday and Aten Ha Ra respawned on Wednesday, you don't get to argue with that kind of schedule because the rival guilds will certainly have no problem killing them at these times, so of course you got to do stuff every day simply because that's when the mob becomes available and if you don't do it, someone else will definitely kill it too. Later on it becomes a matter of politics, as in since the game has even more bizarre class requirement gimmick than this one, you know that the 3rd warm-blooded Beastlord you recruited is needed for encounter X so while this guy is totally useless for everything else, if he whines about wanting to do some lesser content you probably should kill it in case he defects to another guild and now you cannot meet the gimmick class requirement.

As for WoW, people complain about lack of content or too much trash, or bosses that drop nothing useful and just gets in the way all the time throughout its history.