potiuk commented on issue #57431:
URL: https://github.com/apache/airflow/issues/57431#issuecomment-3477954148

   BTW. Theorethically, yes - you COULD set PIP_CONSTRAINTS as env variable - 
but it has a number of side effects - for example if you override it with your 
own `--constraints`, they are not used and that can lead to even worse problems 
that will be even more difficult to explain. Also PIP_CONSTRAINTS leak to 
"build-isolated" packages (whic is both good and bad depending on the 
situation). Also it's a little bit "magical" so (following python zen "explicit 
is better than implicit") we opted for explicit way of pinning airflow.


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