“If a man gives no thought about what is distant, he will find sorrow near at hand.”
— Confucius
When you hear that we can't make estimates, we don't need to make estimates, we don't want to make estimates, because somehow, some way, they are the smell of dysfunction. Think of this quote.
If we don't now what the cost of our work will be in the end, when that work will be complete, what will be produced from that work — and most importantly of that work will actually produce what those paying us to do the work need to do their work — then we're likely going to come to grief.