It’s strange that we don’t have a duck mount, almost three years have passed since Dragonflight went live, why is that relevant you ask? Because ducks featured predominantly in that expansion. There even was a quest where you ride a duck! The model is already in the game files.
People have made numerous requests for a Duck mount on every website that Blizzard frequents, but still, nothing. It’s strange.
That is actually how they used to do it: take a more or less “cute/whimsical” concept and then put their grim spin on it.
Murlocs used to be these funky looking fish people, but they were bloodthirsty and would jump you at any moment. Just look at that poor guard that was literally torn to shreds in Elwynn by the lake.
I think it was Tolkien who argued that good fairy-stories require a touch of horror. I’m not opposed to cute and light-hearted elements, but there needs to be balance, lest the world lose its gravity. The real issue is not what gets added, in my opinion, but what’s missing. All the duck mounts in the world would be fine, if we also got a quest with wereducks feasting on travellers’ corpses, as an example.