If that's where you're focusing, I think we can still work through a few ... caveats? I guess? First we'll need to acknowledge that the people in charge of the scenario in all likelihood just though it'd be cool to have dragon waifu tap into her magical girl and fight out our side in glorious cutscenes. And now that we've acknowledged it, let's set it aside and pretend we didn't.
But Shiva is a unique case thanks to two overlapping factors.
First, her primal isn't essentially an overpowered Elemental with an independent volition that truly believes its a god, perpetually summoned and killing the land and tempering followers and falling into a positive feedback loop of survival and empowerment. Even Ramuh, the "peaceful" primal (for reasons that will be revealed in the future), still exudes a corrupting aura and encourages the divide between the sylphs and causes the aetherial decay of the land (as far as we know). By contrast, Ysayle uses short bursts of aether to manifest Shiva as a suit of armor and that isn't worn for very long. (Allegedly her ability to do this was by virtue of the Echo but the devs will neither confirm nor deny that Thordan somehow acquired it (perhaps via Elidibus the same way he granted it to the Sahagin elder) so we can only speculate speculate speculate.) We haven't seen many such primals (...yet? Though it seems too convenient of a plot device and would cause catastrophic retroactive villain decay, imho)
Second, Ysayle was using these short-bursts of summoning to follow the Warrior of Light's path: striking at the root causes of conflicts and ending them thereafter. Thordan might have been another primal-suit under mortal control, but he was going to antagonize and escalate global conflict. In the big picture, you could weigh the damage done by Shiva's summoning against the damage prevented and (by virtue of it being a short-burst summoning, under mortal command, wielded to uproot conflict) it would be a worthwhile purchase.
Perhaps the main reason it seems so hypocritical is because it's literally the only example and also serves as an exception.
This is ostensibly on track to go sideways in the future. Urianger threw a wrench into what the Warriors of Darkness were actually assigned to accomplish: defeating extremely powerful incarnations of the beast tribes' gods so utterly that it broke the tribes' faith in them and forced them to look to a "new god".



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