Well genetically speaking unless every race in Eorzea came from a single ancestor and still had very similar genetic makeup with only slight variations, for example Elezen were really just Hyur that were taller and had pointer ears, or Miqo'te were just small Roegadyn with feline features, then every race in Eorzea has about as much in common as we do with dogs. Races being sentient does not mean that they have any genetic similarities, and without those it would be impossible for their to be cross species interbreeding.
This of course is a very scientific way of thinking, in most fantasy games evolution and genetics are pretty much non-existent so hybrids could be completely possible.
This of course is a very scientific way of thinking, in most fantasy games evolution and genetics are pretty much non-existent so hybrids could be completely possible.
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