This raises a new question about the echo for me. Does it work like parceltongue in Harry Potter?

What I mean is, we can understand every language on Hydaelyn, but interestingly, the Ixal/Sylphs/etc also understand us. Does this mean we are instinctively speaking their language without realising it?

Or do the beastmen understand the language of Eorzea but either choose not to or are incapable of speaking it themselves?