Disappointed in the turn the Garlean Empire has taken

[Nalien]

The fact that they press ever onward, ignoring the mounting evidence that their incursions are causing more problems than they're solving, makes them quite unsympathetic.

I disagree with this some what. We still don't really have a picture of what occupied territories are like, only areas with a heavy resistance that can cause trouble and give tribes a window to summon Primals... Lakshmi only showed up when we started taking ground, not before. Susano was basically summoned as a direct result of our actions too, and Tsukuyomi was another Ascian plot against us... Other than that? Not a whole lot of Primals... Compare that to Eorzea, most of which weren't even summoned in response to Garlemald, they were summoned as a response to the City-States being dumb... When they were summoned against Garlemald, Gaius actually made incredibly short work of them, thanks to Ultima Weapon. Bismarck is the only real bad case I can think of in game, I guess you could throw Thordan in that mix.

While we weren't directly involved, Rabanastre was also a result of heavy resistance, and even then Primals weren't involved... It honestly seems like, once an area is locked down, Primals stop being an issue within Garlean territory. We'd need a lot more "Life under Garlean rule" stories to know for sure, but it seems like they only cause a problem during conquest, after it? Their conquest achieved its goals.