Hi CJ,
I don't think that the issues addressed by bento have been tackled much by anything in the python ecosystem. It is true that binary distribution today is much better than it was in 2008/2009 when I started working on Bento, which means much fewer people need to deal w/ distutils errors on a day to day basis. But distutils is pretty much as bad today as it was 10 years ago.
If I were to start it today, I would have made different choices, as I was still very much a novice when I started bento :) But IMO the main failure is the lack of community around it. I still think the main ideas around it is where distutils2/whatever-it-is-called should go.
David