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But then knowing something is X feet in the air only gives me an approximate floor number- I'd have to guess at the storey height and divide.

No question, I considered that too. But for determining position in 3d space I think its more consistent than having floors. If you get to say the 10th floor with different floor heights the difference could be considerable. Its the problem with whats practicable in daily use and what makes sense from a system perspective.

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