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I'm suggesting PendingDeprecationWarning because we can't *actually* deprecate anything until we provide a more transparent alternative that offers comparable functionality, and I haven't seen a credible proposal for a replacement yet.
So using PDW would truthfully indicate "We don't like this feature, and want to get rid of it as causing more problems than it solves, but also acknowledge that it is currently handling legitimate use cases that need to be addressed before we can remove it".
https://coverage.readthedocs.io/en/coverage-4.4.2/subprocess.html is one example I'm aware of that describes a legitimate use case for being able to run arbitrary code at software startup.