Waterfall development, i.e. "depending upon blueprints before you get started" was an anti-pattern when it was first described, and it's finally dying now. You'

Waterfall development, i.e. "depending upon blueprints before you get started" was an anti-pattern when it was first described, and it's finally dying now. You're describing iterative development. Everyone's getting onto scrum and agile now, even the sceptics who can see that it has benefits as you describe.