The idea is brilliant, but I’ve found that it never works. For each time I have employed the idea, something always goes awry. It could be a lack of control due to massive sub-contracting, or it could be poor expectation management on the account manager side. Either way, it always seems to have to be all three, or else you lose the client.
In other words, you can pick from column A and B, but unfortunately, we give you C. God Save The Change Order.