There's two main reasons Gyr Abania feels like it didn't get developed as much as Doma did.
The first one is that Gyr Abania had a lot of it's history explained to us all the way back in 2.0 (and 1.0 even). We've known about it's history and the type of problems it has with the Empire for a good two expansions by the time 4.0 comes around. So we don't really learn a lot of new things about Gyr Abania in 4.0. Instead, we mainly see how bad the Empire treated them and saw for the first time how bad it really was. In comparison, we didn't know anything about Othard. We knew certain cultures and races came from there, but we knew very little else about it. So most of the new information of 4.0 is all about Othard. None of the Gyr Abanian information felt new. If you look at the total information we have on Gyr Abania and the total information we have on each country/culture in Othard, it's a lot more even. But that can be hard to remember when most of the Gyr Abanian information doesn't have the "newness" to it that Othard's does.
The second is the Gyr Abania only has one culture in it while Othard/Hingashi has three. All the previous expansions have focused on three cultures at a time (2.0 is La Nosca, Thanalan, Twelveswood; 3.0 is mainly Ishgard, Dravania, Allag). It would have been really hard (and boring) for an entire expansion to revolve around one culture we already know a lot about already. So the Dev team included three new cultures for us to learn about so we could get more new information (Doma, Hingashi, Xaela). So you've got the three new cultures and the one culture that has always been around, but never had anything done with it. This makes the lore of 4.0 feel lopsided.
Also, we can get to parts of Ala Mhigo, the city. The Peregrine Quarter is part of the Lochs and is an entire district of Ala Mhigo. If anything, it makes Ala Mhigo feel like one of the biggest cities we can get into as the rest of the city we can't get into isn't constrained by video-game scaling. All the other cities we can get into (Limsa Lominsa, Ul'dah, Gridania, Ishgard, Hingash) feel too small for their function. They should easily be five times bigger. Ala Mhigo actually feels like the capital of a region.