We don't need yet another step on the euphemism treadmill. Say "defect" long enough and eventually it represents the same idea as "bug". I have an instant negative reaction to the idea that "if it has defects, it may not be shipped ". Any moderately complex piece of software is guaranteed to have bugs. The action space of ex. a modern OS is way too big to test every possible code path. I'd rather have an OS with a few bugs than no OS at all. Move fast and break things (unless you're writing code for a space shuttle).