Serhiy Storchaka added the comment:

It's not just the support burden. It is also a burden of learning and 
remembering new API.

The support burden itself is not tiny too. It includes careful designing, 
writing the implementation and test (the more options you have the more 
combinations you need to test), increasing running time of tests (CLI tests are 
slow!), and you need to return to that after adding every new feature for 
testing compatibility with them.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29636>
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