Well yes but it takes guts to sign off a letter by your name because it will always be out in the open. Come to think of it, Jobs signed out "Thoughts on Flash" with his name but this is not quite the same. Still searching!
Hardly the same. It starts off by essentially saying "b-but everyone else does it!", and nothing even remotely close to "we fell short on this commitment" or "We are extremely sorry".
Jobs wasn’t good at apologizing. That doesn’t mean he was unable to recognize and correct errors – but before there was a solution to some problem, he had a very hard time acknowledging the problem or even apologizing for it in public.
So while he might say “Yeah, what we had sucked, but our new thing fixes all these problems!” he wouldn’t really do the same so openly in times when there is no clear solution in sight.
