[adamnemecek]

I have posted it many times yes. You hit it on the head. They are very good for modeling for example rigid transformations or robot joints.

They are a special case of GA. I used to very much into GA only to realize that dynamic 3D is the most interesting space, the other spaces are actually kinda boring.

[yiyus]

For sure they are an interesting concept, thanks for introducing me to them. I cannot apply them to my work (crystallography) because we are only interested in orientations, but they may come handy at some point.