You also forget that the event lasts 2 months, which is probably why the drop rate is low. If you could get it all every time, then the event would die out sooner and may as well just lasted a few weeks.
I don't think anyone considering doing the event has "forgotten" about this

The complaint is more that the event feels arbitrarily stretched out *because* it's lasting for 2 months. This degree of grinding was never necessary to obtain all the rewards from a "one for every class" event before.

It'd have been another story if it actually had you doing different stuff to obtain these things, like some past events have offered you a choice in activities to get your tokens... but here it is just all FATEs, and all regular FATEs that we've probably all spammed to oblivion before for EXP/atmas already, not even any new event-specific FATEs.