I'm seeing these warnings pop up from time to time with various third party packages (such as pyparsing which is invoked by ensurepip).

Am wondering whether this should be deferred for another version or so until be have good confidence that the major third party packages have all had a chance to adapt.  Otherwise, this will mostly be noise for end-users.  Also, it gets in the way of the end-user strategy of "backslash anything that looks special" as preferred over "remember exactly which things are special".  This may be a case of "the cure is worse than the disease".