In #90276, I grouped the functionality related to importlib.resources into its own package (creating clearer separation of responsibility from importlib.*). That included moving some abstract base classes from importlib.abc to importlib.resources.abc. We need to officially deprecate the presence in importlib.abc and then remove them in a future release.

• deprecation: gh-93963: Officially deprecate abcs and warn about their usage. #93965
• documentation: gh-93963: Document importlib.abc deprecations #94546
• cleanup: gh-93963: Remove usage of deprecated interface from importlib.abc. #95217, gh-93963: Remove ResourceReaderDefaultsTests #96598
• removal: gh-93963: Remove deprecated names from importlib.abc. #94528
• removal: gh-93963: Remove deprecated names from importlib.abc #119720

Originally posted by @jaraco in #93610 (comment)

Linked PRs

• gh-93963: Remove deprecated names from importlib.abc #119720