The new show starts tomorrow, so it would be a good idea to get all of the bad ideas about how the original show can be improved or ruined here and now. I don't mean bad takes or hot takes or political anything, just deranged ravings that have probably never been said before, as this is potentially the last time such a thing can be done without the influence of the new work.
First: Appa and Momo are clearly the same species, given that they both fly, seem to be the only extant iterations of their sort of being, and come from the same Air Temple as Aang. The show is titled as though Aang's supposed to be the last airbender, but clearly Appa is airbending and probably Momo is as well, so the only logical explanation is that Appa doesn't count because Appa has "First Airbender" status for being of the species that were the original airbenders and Momo doesn't count for being of the same species as Appa. I took logic classes in school, this makes sense. It's called induction.
Furthermore, the two most compelling explanations of how a flying lemur and a six-legged buffalo-thing can be the same species are (1): the lemurs are a larval stage and the buffalo-things are the adult stage or (2) the lemurs are the adult stage and the buffalo-thing is an ootheca/cocoon/pre-larval mass that eventually bursts into many lemurs. The difference is whether Momo looks at Appa and thinks "Mommy?" or "Little brothersisters!"
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Of course, this doesn't extend to appreciating the animation of The Legend of Korra, because that show had "Bad Writing", and thus the off-model frames or visual-inconsistencies-between-episodes aren't forgivable in the way they seem to have been for the original.