I've opened a PR to disable support in 3.10 with removal in 3.11 according to the guidelines outline in PEP 11. Given the unlikeliness that anyone is actually still using this feature (and are possibly already broken by a bunch of other things), would it make more sense to do the removal in one go? I do see that systems without multithreading support were both unsupported and removed in 3.7, though I do not know the particulars of why that is the case since most other entries have a 1 version gap.