It'll be enforced by the team as well. After all, if the person continues to chime in on emails or commit code, then they're not upholding their end of the barg

It'll be enforced by the team as well. After all, if the person continues to chime in on emails or commit code, then they're not upholding their end of the bargin with their team (that they'd build good enough systems and write good enough code so they don't have to always be present). And by "enforce" I don't mean that we have some formal reprimand process or anything, obviously. But if it becomes an issue, we'll deal with it.