His agility is largely a consequence of the equipment he uses. It's a flawed argument, though it's pretty clear that those arguing for a 'short character' care very little about Viera and are pretty shameless about trying to hijack them into being something that they're not.

I imagine Viera men looking like the concept art posted very early on in the thread would appease the greater amount of players compared to making them very short and slender. It'd also fit better with how they're presented in the lore.