Antoine Pitrou <pit...@free.fr> added the comment:

The problem with changing the default is that this will break any application 
that depends on passing non-picklable data to the child process (in addition to 
the potentially unexpected performance impact).

The docs already contain a significant elaboration on the matter, but feel free 
to submit a PR that would make the various caveats more explicit:
https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40379>
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