I was being facetious in that one line. I never expect "all" the bugs to be fixed, but it's equally true that if you wait 8 months, you'll know better what you'

I was being facetious in that one line. I never expect "all" the bugs to be fixed, but it's equally true that if you wait 8 months, you'll know better what you're upgrading /to/. In this case, 10.9 had the bug, 10.8 did not. It's usually the case that as new features are added, it's much more likely that you've added new bugs. Whereas in slightly older code, you might be "out of date" but at least you know where the bugs are, generally, by watching what changes in newer releases and back-port as necessary. And as I think I've said elsewhere, if code is updated frequently, this advice might change -- so long as you're running a stable channel, you can both get new updates and enjoy tested code.