I thought the elevation was no more important than the air temperature.
2000 asl could have the same poi as 8000 asl with different temps.
Density altitude is the term. Same reason as a pilot can take off from a high elevation airstrip in the early morning but can not get the wheels off the ground in the heat of mid afternoon. It is one of the most important, if not the most important setting's in an aircraft. Getting local atmospheric pressure for area in which to land or sitting on a "known elevation" and adjusting altimeter before taking off. Resulting in correct 'density altitude".
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