What areas of lore would you like to see more of?

[Enkidoh]

How do Alliance forces take out juggernauts or dreadnoughts?

Well, Drest's situation in Eastern La Noscea pretty much showed that the Alliance actively shoots down Garlean fighters such as Juggernauts with cannons (his Juggernaut he specifically stated was shot down by Maelstrom cannons), which would also explain the various wrecked airships and machina lying around the Fringes as well.

And lets face facts, Juggernauts are hardly aerodynamic and somewhat cumbersome (resembling a flying stovepipe more than anything), thus they'd probably be much easier to hit than you would think, especially if the pilot foolishly decides to engage ground mode.

Also End of an Era showed BLMs and THMs easily destroying magitek armour with mere fire and thunder spells, so for all their blustering, Garlean machina isn't quite as indestructible as they make it out to be.