Ok then, we will have to provide extra documentation to make people
understand that the '.egg-info' directory has absolutely nothing to do
with egg-the-format
but is rather a metadata container.

'egg-info' was introduced with adding the whole 'egg' thing in Python
in mind at some point I believe.

And it seems that the .egg directory/zip file for projects setuptools
provides will not make it into Python
and is still very controversial
(http://www.reddit.com/r/Python/comments/8he79/am_i_alone_in_feeling_like_python_got_a_whole_lot/)

So removing the 'egg' part of 'egg-info' seemed natural to me at this point.

Egg-the-format is what we are recreating in distutils, isn't it? Obviously some people are unhappy with some things related to packaging, but I don't think egg-the-format is something people actually mind (if they know what it is). Of course few people really know what the format is, or are able to distinguish it from other parts of the Setuptools stack, but that doesn't change just because you rename the extension. Eggs don't even carry any particular naming attachment to Setuptools.