Thanks OOPer for your timely response. Let me clarify further. In other words, you should not expect that the points would be updated even if you performed another VNDetectHumanBodyPoseRequest. This is not my expectation. I have some code that may inspect a single observation multiple times. Due to some business constraints, it's possible we may query, for instance, for LeftHand more than once on a single observation. I am wondering if it's worth maintaining an external cache of queried points for a given observation, or if it's safe to assume the observation has such a structure internally. I suspect the latter is true and it seems like you agree.

Sorry, typo in my question title!: https://developer.apple.com/documentation/vision/vnhumanbodyposeobservation