Why does standalone install require Python2?

Python2 on Mac OS has been fully removed at the system level and cannot be installed via Homebrew anymore. I know about #327 and that #368 is waiting for approval to work around it, but Python2 is in fact uninstallable on MacOS, so unless the core dependency on Python2 is updated we will still not be able to install or even build local versions on Macs.

Start by reviewing the related discussions in #327 and #368 to identify the core Python 2 dependency affecting standalone installation and local builds on macOS. Done means the standalone install and local build work on macOS without requiring Python 2.

Written by the indexing model from the issue text.