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In general with tf2 it's recommended to use a native linear math library which has an internal representation of the quaternion and as such should have logic for normalizing and checking the normalization of the quaternion. The API of tf2 is specifically scoped down to be specific to the buffer etc and not random linear math problem.

Re: why normalized. @Mike Scheutzow the reason to rejecting storing non-normalized quaterions into the storage is because they can effect future computations in ways that are untraceable to users. You can find more info at https://stackoverflow.com/questions/11667783/quaternion-and-normalization