I don’t necessarily agree with Jeff Johnson’s conclusion that major software upgrades are impossible on an annual schedule. I also don’t know what he’s looking for, as someone who worked at Apple during this time quality improved substantially in 10.6 Snow Leopard and continued. Most bug fixes don’t get a marketing line item or even much fanfare. We were all users of what the OSX guys were doing and lived on the dogfood while we made our own mistakes on iOS.

As I age I realize you need to entice the user with more value and service - anew features. It cannot just be quality, but quality is table stakes and the minimum expectation. When things get out of hand organizationally it makes sense to call for a snow leopard, but it comes at great cost so you better make big changes in the system so the same mistakes are not repeated.