Pop Set Notorious Monsters

[Enkidoh]

Kind of how Chimera stands waiting for those with the Quest active, but does not appear if you do not.

Not any more - the relic quest Chimera is now on the Duty Finder and no longer appears physically in the Weeping Saint (it's now an instanced battlefield that even has the same entrance like a dungeon). And before you pass judgement players actually wanted it like this. Just like instanced dungeons.

It all comes back to accessibility - SE wants content to be easily accessible by everyone, and not just an 'elite', hence open NMs are on FATEs which cannot be claimed by only one person. Not to mention using pop items inevitably leads to camping of whatever drops that item in the first place, it merely passes on the temptation to be claimed by botters and RMT to something else.