"malibuman", While I appreciate your position I think I'll stick with my perception that a well devised and carefully executed plan will trump a "Ready, fire, aim" approach.
As a project manager I've learned that success relies on attention to detail and identifying events that may threaten the critical path.
Succumbing to outside pressures to shorten timelines, cut costs, or change the project scope typically yields cost overruns, shoddy results, or an abandoned project.