> Either somebody is interested in MESS or not.
Wrong. There is also a third category, the biggest category, people who know of MAME but have never even heard of MESS. Having the two projects merged neatly solves that problem. More visibility for MESS, or even MAME, is never a bad thing, because it inherently attracts more developers to the project. Don't believe me? Look through the most recent whatsnew.txt files at all of the people who have suddenly popped up and started contributing since MAME switched to being hosted at Github.