[hassleblad23]

Because quaternions are awesome? :) it definitely feels like a discovery when you learn about them first.

[gamedever]

Are they?

[Let's remove Quaternions from every 3D Engine] https://marctenbosch.com/quaternions/

[xeonmc]

I feel like there should be a followup post "Dear Sir, you have reimplemented quaternions" noting how implementing GA and using it only in 3D gets you precisely right back to quaternions-but-with-a-different-name since they're isomorphic when specialized for 3D.