The deprecation warnings weren't turned off due to Python developers running things in virtual environments - they were turned off due to Linux distros upgrading their system Python runtimes, and Linux ISVs getting an influx of new bug reports from their users.

So the cases of relevance were ones where all the app dependencies were bundled *except* the runtime itself.

By contrast, one of the things we *want* to warn about in this case is folks acquiring transitive dependencies on provisional APIs that they may not want to depend on.