> Thus strip and isspace are now unusable methods in Python for common use cases.

Please recognize that you haven't demonstrated this at all. U+200B is
*not* a character that is common, not even remotely. It's a rare,
infrequent, unused character. In addition, in the common use case
of string.strip (i.e. get rid of leading an trailing white space for
rendering purposes), keeping it causes no harm since it's zero-width.

If you disagree with the resolution of this issue, you will have to
write a PEP.