I just started playing again after about a year and a half, and I can't help but notice that people from Doma literally have the exact same accent as those from Eorzea. In fact, generally everyone has the same accent regardless of where they're from. In real life, people that are geographically separated speak differently, even if they happen to share the same country, and this difference is more so pronounced if they live on separate continents.
If you were to close your eyes, you couldn't distinguish a Doman like Hien from your typical Eorzean NPC. Like given the whole far eastern theme, wouldn't it have made more sense to use a Japanese man with a Japanese accent? To be honest, it doesn't even have to be Japanese, per se, just different.
Using Elder Scrolls as an example, there was a distinction between a Khajit or Argonian compared to the rest of the populace when they spoke. So, shouldn't Miqo'te, Elezen, Roegadyn, and Au'ra sound different?