This avoids the problem where Blender doesn't start because the PYTHONPATH points to an incompatible Python version, see T72807. Previously we chose to assume people who set the PYTHONPATH know what they're doing, however users may have set this for non Blender projects. So it's not obvious that this is the cause of Blender not to launch on their system. To use Python's environment vars, pass the argument: --python-use-system-env Note that this only impacts Python run-time environment variables documented in `python --help`, Access from `os.environ` remains.