One thing about RGN that is often over look is the cumulative effect and context of it.

For a player who already finish the previous contents, a new RGN based content is nothing.
(Full fledge omni-crafters going for all zodiarks zeta since nothing to do for example)

For a player who still working on crafting and trying to get his first zodiark weapon, RGN is everywhere. Which is time consuming since you are restricted to only do one thing. (Trying to manage gils, seals and time)

That why most ppl now hate RGN based contents since it hold them back for nothing. RGN is just something to keep contents last longer.