Lynch has had considerable experience with affordable-housing issues and 40B specifically for a couple of decades. His city has successfully added to the stock of middle-class and lower affordable units. Yet, he doesn't see 40B as a panacea. He describes in detail what he sees as problems with implementation.
He describes that tenuous balance of enabling profitable development opportunities that will inspire building types, while not driving all but the wealthiest citizens away.
Most unfortunately, tweaking 40B is not part of the ballot question. That would be keep it or kill it. We all need to get smart on this issue.