Why do the bosses/raids in this game feel so lifeless?

[Edax]

Do you have some examples? Generally dungeon bosses feel like they belong in that environment at least to me. I'll grant that the timing of Susano and Lakshmi in the msq were pretty convenient 'wait we need to have trial fights here' but generally outside of Omega, which by design is just throwing in FF fanservice bosses without context, I don't really see this as an issue.

Why is there 2 Coeurl O’Nine Tails guarding magiteck terminals in the Thousand Maws of Toto-Rak? Aren't they plants who need sunlight?
Why is there a Great Yellow Pelican, Deep Jungle Coeurl in Brayflox's Longstop? Are they guarding the Dragon? If so, why does the Dragon just eat the Hellbender in the middle of the fight?
In Dzemael Darkhold, an army of Voidsent have been sent into the realm, conveniently with 3 random bosses that just sit around far apart from each other waiting for adventures to attack them.
In The Wanderer's Palace, there's a Goobbue and a Flan guarding it as bosses, despite it being a Nymian Palace taking over by Tonberry. Are Tonberry allied with the flan or something?
Snowcloak is Ysayle's hideout, yet it's guarded by an Elemental, an Abominable Snowman and Fenrir. Like why? Did the heretics form an alliance with the Yeti or something? Do the wildlife of Coerthas support the heretic cause?
That's just up to level 50, and I could go on.