After Dawntrails abject Failure of a Story, there need to be serious Consequences

[honest_psycho]

And yet, these have very reasonable explanations...

-The Urqopacha region is rather isolated, and the giants themselves further intentionally separated themselves from the rest of the population. Valigarmanda gets released, attacks the isolated settlement, and promptly flies off to the mountain to recover and gets defeated before he can. It's likely most of Tural doesn't even know anything happened, and the creature being defeated for good (instead of just imprisoned) could cause the celebration to trump going after Bakool Ja Ja for the time being in the giant's minds.

Sorry but no. The highpriest should absolutely have sent a letter to the King, telling them "Hey, this one contestant actually unleashed this mighty beast that we tried to keep sealed for 80 years and could have wrecked the continent."
Bakool Jaja should have been disqualified, if not outright executed for domestic terrorism.
The only reason this didnt happen is because the writers needed him to have his redemption arc so our dearest Wuk Lamat can befriend him and pretend to be a such caring dawnservant. Blech.

-When Zoraal Ja kills Gulool Ja Ja, we at that point have absolutely no idea how regulators work. All we do know is that Zoraal Ja can come back from the dead (potentially as much as he wants) and just completely wrecked a guy who was a highly competent fighter that took both us and Estinien to a draw. On top of that, Zoraal Ja straight up tells us he's calling off the attack for now and giving us time to hunt him down. Attacking him would have been incredibly boneheaded. Attack a guy with unfathomable power and potentially cause him to continue using his nigh-invincible army to kill everyone in Tuliyollal, or let him go, keep everyone else alive, and have time to learn what we're facing...easy choice.

I do not believe for a second that this is the reason why NOBODY tried to even intervene.
EVEN IF, should have been a moment where the WoL tried to, only to be hold back by Koana or someone else, saying out loud the reason you've given. But we didn't even get a "clenching fists moment" or a "damn we can't do anything"-comment from one of the other Scions.

Also, this scene could have been comepletely avoided if we had "arrived late" and saw this whole scene via the Echo, no awkward "just standing there"-type of garbage writing.

-Wuk Lumat is clearly a skilled warrior and well-built as such from the first moment we meet her. The things she lacked were confidence and real motivation.

Another person already explained why this is total bs, but you didn't adress this for some reason. HMMMMMMMMMMM

Endsinger has the ability to manipulate Dynamis far better than a regular person can by being an Entelechy who runs on Dynamis. Their very essence is heavily affected by the surrounding Dynamis. Meteion naturally has the ability to communicate through Dynamis, soar through Dynamis waves, etc.
And I'll have to repeat again, we fought Endsinger in an area that is aetherically lacking and dynamis is omnipresent over centuries and centuries of build-up. The Final Days isn't something that came out of thin air. It was the collective dynamis of many untold civilizations that Meteion visited before centuries of build-up. That's why it's immensely important to realize Thancred's role in Endwalker in the Final Zone, because whoever's feelings is strongest only matter in an unique zone where emotions dictate reality.

The same cannot be said of the races living in The Source. They have the ability to use Dynamis, but nowhere in any amount like the ones who are specialized in this, nor are they living in an area where emotions are the only factor. Being in an aetherically rich environment and being unable to manipulate aether is why Garleans were shunned and drove them to live in the frigid tundras in the first place. This is a world where aether has far more sway over dynamis where the former drowns out the latter in most instances. That's also why we ourselves need allies to be able to affect the surrounding Dynamis as heavily, because each person has a limited ability to pull the surrounding dynamis. That's why even solo quests that have LB (ex: Alphinaud's solo instance with NPCs fighting alongside him) has only one such use of Limit Break, and it's generally saved at a pivotal moment, not spammed wantonlessly. It's an phenomenon filled by a build-up of emotions, but that has limits as long as we're in The Source because this is an aetherically rich environment where dynamis takes time to gather back up. That's why the shroud of aether works for years to prevent the Final Days.