I miswrote. Rotation calculations are represented (in quaternions and in geometric algebra calculations) as a 3D subspace of R^4, with the "extra" dimension accounted for by constraining quaternions to the unit hypersphere.
Rotations do involve magnitudes when interpreted as an axis (2 dimensional manifold embedded in R^3) and a magnitide (0 to 2pi)
Don't quite understand the point of your comment, maybe I am missing some context, but yes. Are you objecting to my "throws out"? I suppose it is suboptimal because it could be misinterpreted as meaning "eliminates" rather than the intended "generates".
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