Surprise: No Patch in March.

I do testing for our software at work (that's not my real job - I'm just the last person standing who knows anything about our ancient program), and quite often, a move to production will be delayed because a major new feature or fix is bugged. It's too much trouble to take that one thing out (and might cause problems with some of the minor fixes, which have been tested with the big thing). Also, every patch, no matter how minor, risks creating a major new bug (or, as so often happens) reviving an old bug.