"This is what happens when you let someone who is lousy at designing interfaces, design interfaces." Fixed that for you.
Sure, the interface is pretty sadistic for Yet Another Scheduling Tool, but maybe the original goal wasn't to make another FogBugz -- maybe it started as a prototype to explore different ways of munging data from project schedules. Comparing the original Joel article to the current Evidence-Based Scheduling approach of FogBugz, it's possible that even the HCI wizards at Fog Creek hacked together a few obtuse prototypes before finally settling on the right combination of plumbing and porcelain.