That a Cray was not all that useful for electronics design (E-CAD) is besides the point. Steve said buy the fastest computer available, and they did what steve says!
Today, the games you can play on your iPhone/Android or even the aging Nintendo DS have better graphics!! Resolution is a lot lower (not 3000x5000!) but at the screen size it certainly looks much better - and rendered in real time!
Karl's version of Parkinson's Law: Work expands to exceed the time alloted it.