Not always…
Push Notifications ended up shipping nine months after they were scheduled to under Jobs, and Mobile Me was a disaster.
Not to mention to parallel the Photos redesign, under Jobs there was the controversial launches of both “iMovie 2008” and “FinalCut Pro X”.
The former led to Apple having to allow downloads of the previous version of iMovie 2006 because people were so upset.
Also Steve delayed things as well, Mac OS X Leopard ship about a year after originally promised, the white iPhone 4 shipped almost a year after originally promised.