I don't see why it couldn't be viable. I mean where chocobo's are far more common and quite agile, there are plenty of other options for Eorzeans in the end. Give them a chance to get a feel for the beasts and I'm sure some important people could be really taken by their power.
So where chocobo's are easy, in great numbers and still the most common, the horses could easily be trained for war, possibly in smaller numbers, or maybe as something officers obtain since they're not nearly as common as the chocobo and are a lot more sturdy and powerful than them, so could be seen as status too. *shrugs*
I certainly could imagine a handful of possibilities
So where chocobo's are easy, in great numbers and still the most common, the horses could easily be trained for war, possibly in smaller numbers, or maybe as something officers obtain since they're not nearly as common as the chocobo and are a lot more sturdy and powerful than them, so could be seen as status too. *shrugs*
I certainly could imagine a handful of possibilities
"The wolf does not lose sleep over the opinions of sheep"
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