See prior and current discussion, it’s not a small decision and has large ramifications:
https://discuss.python.org/t/pep-703-making-the-global-interpreter-lock-optional
https://discuss.python.org/t/pep-703-making-the-global-interpreter-lock-optional-3-12-updates
https://discuss.python.org/t/poll-feedback-to-the-sc-on-making-cpython-free-threaded-and-pep-703