Sure, estimation is needed. But the more important thing is that project _management_ must involve the constant updating of those estimates. After all estimate

Sure, estimation is needed. But the more important thing is that project _management_ must involve the constant updating of those estimates. After all estimates should be data based. As more data comes in they should get more accurate not less. If they don't that's a sign of basing them on hope or whatever ideology someone found instead of hard truths.