Random rant about wyverns. Yes I have autism.

Don't get me wrong, I like wyverns. Four limbs (two wings and two legs) makes sense for a dragon. My gripe with wyverns is that they're considered to be the more "plausible" kind of dragon.
Leaving aside the whole argument on whether or not it makes sense to want a dragon to be "realistic" - the way wyverns are usually portrayed is consistent in their posture.
Wyverns have this sort of squatting, bat-like posture. It makes them hunched-over, scary, etc. But let's examine why bats have this posture. Bats have this posture because they're very small. They don't walk very well, if ever, and instead of resting on the ground where they're easy prey, they rest by hanging from things. Walls, tree bark, branches, roofs, you name it. A wide, hunched stance helps them cling to vertical surfaces.
Meanwhile, a wyvern is by most animal standards, enormous. They can't cling from anything, or hang from anything, they would simply be too heavy. Therefore, giving an animal the size of an elephant the same posture as a bat is to me, nonsensical, and far from plausible.
Instead, as large noble creatures, they should have a more upright posture. We already have examples of enormous flying reptiles, the Azhdarchids, and it shows a clear, upright, giraffoid posture that also enabled them to move with grace and majesty.
In my opinion, more wyverns should be portrayed as such. It crosses the bridge between the squatting wyvern and the more noble, six-limbed design perfectly. Plus it's just more plausible.