I do agree with Theodric that SB really did not feel like war at all, which probably just made the feeling that they are not that great as conquerers even bigger.
We know that we only got Ala Mhigo and Doma back that easily because Zenos did not care about these countries, but why then send someone like him there? Why let someone rule these places that randomly kills someone from their own ranks? These two states might not be the biggest but these wins will give Eorzea the chance to unite into a complete and bigger alliance and Garlemald loses his grip in these lands. And on top of that thanks to them winning more rebellions might raise in the future. So why not protect these states more? If you have such a huge army why not send more of them there?
So I really get the feeling that they are maybe not that big either. On top of that they are using lies and more to get states under their rule and it seems that primals are still a huge threat for them.
I do believe that a huge problem with Garlemald is the restriction of being an MMO and maybe not wanting to take some risks. War can never truly feel like war if you have barely any people fighting in it. If a bunch of rebells, the scions and the Xaela can take a whole small nation back something seems wrong. They could have made a scene where we see the burials of the people we lost thus giving us a way better sense on how big it truly was. At the same time the flagship of Garlemald is still hanging out on Azys Lla and probably waits for the day the plot demands it too move..but I just cant believe that they were not able to repair it since HW..
The game also has the problem that it cant really do an assault on the states. Bahamut was different since the game was remade after that and there was a time span so they were able to do some damage to Eorzea. (But imo its still not enough and its still funny seeing Bahamut directly attacking Limsa in the video and yet missing most of his attacks..) So we wont have any true big assaults on the cities since they would need to remodel it all. But this restriction already takes out some of the danger and fear. It was the same with Alexander who was such a huge threat to the land but we never truly saw any kind of consequenes on it thus it never truly felt like one.