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I think it's just a matter of RP/personal preference.
Because the Echo gives us (as the single-player) the ability to understand all languages, we never really see if it's a result of everyone speaking a common tongue of if our characters just happen to be fluent in everything.
There's a gradient of people who RP between [everyone speaks the same thing all the time and everywhere] <-> [Each race/nation has its own language, or had its own language once]
Personally, I like to think that some nations have certain other languages. Like Ishgard, Garlemald and Doma. And I'd imagine some Sea Wolves might possibly practice their old language. Miqo'te as well.
Because the Echo gives us (as the single-player) the ability to understand all languages, we never really see if it's a result of everyone speaking a common tongue of if our characters just happen to be fluent in everything.
There's a gradient of people who RP between [everyone speaks the same thing all the time and everywhere] <-> [Each race/nation has its own language, or had its own language once]
Personally, I like to think that some nations have certain other languages. Like Ishgard, Garlemald and Doma. And I'd imagine some Sea Wolves might possibly practice their old language. Miqo'te as well.