The no-GIL or "free-threaded" builds are still considered experimental... The Python team wants to alleviate as much of the single-threaded performance impact as possible before giving the no-GIL builds the full green light.
Another forward-looking feature introduced in Python 3.13 is the experimental just-in-time compiler or JIT... Right now, the speedup doesn't amount to much (maybe 5% for most programs), but future versions of Python will expand the JIT's functionality.
Some of that baggage consists of standard library modules that have fallen into obsolescence or are no longer actively maintained... These aging modules have been called dead batteries.
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