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I think for some builtins it may be usefull to have keyword arguments, in the case they take more than one parameter.
Typically, it's impossible to write:
 self.drop_elements(partial(isinstance, type(lxml.etree.Comment)))
Because isinstance take its argument in the "other" order, we may bypass this using keywords arguments:
 self.drop_elements(partial(isinstance, type=type(lxml.etree.Comment)))
But isinstance refuses keyword arguments, so there is no way to write this without a lambda:
 self.drop_elements(lambda x: isinstance(x,
 type(lxml.etree.Comment)))
With is cool and work, I agree, it's just an example to explicitly show why keywords argument may be cool: functools.partial.