John Walker, Xanadu's most powerful protector, later wrote that during the Autodesk years, the Xanadu team had "hyper-warped into the techno-hubris zone." Walker marveled at the programmers' apparent belief that they could create "in its entirety, a system that can store all the information in every form, present and future, for quadrillions of individuals over billions of years." Rather than push their product into the marketplace quickly, where it could compete, adapt, or die, the Xanadu programmers intended to produce their revolution ab initio.
"When this process fails," wrote Walker in his collection of documents from and about Autodesk, "and it always does, that doesn't seem to weaken the belief in a design process which, in reality, is as bogus as astrology. It's always a bad manager, problems with tools, etc. - precisely the unpredictable factors which make a priori design impossible in the first place."
http://www.fourmilab.ch/autofile/www/chapter2_108.html continues with:
Absolutely the only way I know to succeed with an innovative product is to throw something together quickly, push it out the door, persuade some lunatic early-adopters to start using it, and then rapidly evolve it on a quick turnaround cycle based on market acceptance and driven by a wish list from actual users.