All these issues were known in previous attempts for removing the GIL. But if Instagram/Meta want it, everyone stands to attention and finds out the obvious problems years later. Kind of like in geopolitics.
I hope Meta switches Instagram to PHP/Hack so they leave Python alone.
The no-GIL work (free-threading) is unrelated to this incremental GC work.
Free-threading actually uses its own, separate GC: https://labs.quansight.org/blog/free-threaded-gc-3-14