The problem isn't the time you need for development. The problem is you are lying.When you need money at the release of f16 you said both f18 and f16's development will go same speed because we have two seperate teams for each module. But now you took your money from customers and now you are telling we don't want to rush but as you said theese two modules have two different income for you and you need to use them seperately as you promised.
You know why customers complain about just don't act like you don't know it. Please stand behind your promises.