Because they'll go away.
Because it's clutter. And because there should preferrably be only one
way to do things. If we left all the old ways around indefinitely, we'd
have code that uses two or more ways of doing the same thing all over
the place. It would set bad examples, to begin with.
I'm not a zope3 core developer, just a zope3 newbie and one of the
things that's annoyed me the most is the confusing feeling I get that
there are different ways to apparently do the same thing.
Kill kill kill all the duplicates!
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