Niagara Initial Mesh Orientation with Random Vector Input

I’m putting this up here mostly because I want to know what’s going on under the hood. When I use inital mesh orientation (IMO) in a niagara emitter I’m usually looking to get the meshes to spawn turned in a random direction. However, when I use the Random Vector input in the Rotation attribute of IMO with a scale of 1 (the default), it doesn’t seem to randomize the rotation.

However, when I set the scale to 0.5 it seems to work fine.

Looking at the description for Rotation it mentions quaternions, which I’m not very familiar with. Can anyone explain to me why my expectation turns out to be wrong? Should I be using the orientation attribute instead? It seems to work correctly with random vector of scale 1. What is the difference between these 2 properties?