And what makes it not enjoyable, save for the lag and loot system? Why is everyone else having fun in killing the horned cow? Why are people excited at the prospect of a challenging fight the first time round?

Heck, their concept video for the IFRIT fight didn't consist if just lancers and conjurers. They did it with all the combat classes, making it highly likely that they did test and try to develop it in vein of balanced enjoyment. And how do you expect inclusive feedback for something that won't be released for full usage? And this is an Eastern developer here, no matter what audience they're aiming for, thy are still gong to use their methods.