I hope Square doesn't keep deeming certain content unnecessary

[Nyarlha]

You can literally cheese half of them with reflect...

The fact that you can cheese CEs and duels doesn't make the time spent designing them somehow disappear. Which is the point of the discussion : CEs and duels took more dev time than Eureka NMs that had zero relevant mechanics.

As an example, you mentioned Louhi earlier? Louhi had nothing beyond a few cleaves, raidwides and some adds. And it was the end boss NM of his zone. Don't come and tell me it was as complex as a CE.