Because &quot;Uh..we&#x27;ll send you a bill when we&#x27;re done for...like...whatever it costs. I guess?&quot; Isn&#x27;t going to go over well when responding to a potential clients RFP. It&#x27;s that or give them an estimate, unless you have a 3rd way?<p>Also, how did you come to the conclusion that &quot;project management doesn&#x27;t work&quot; is a historical fact?<p>Also also, if your teams&#x27; estimates are a farce you might consider starting to track time spent on projects and build up a base of real world numbers you can use as guidelines for future estimates. It worked wonders for us.