Titan is another recent big bet that went nowhere, but so happened to be too big to hide. Who knows gow many other secret dead-end projects they buried.
It was never announced so not comparable to other's dropping projects once they're in the open, and if all we're relying on are rumours and industry analysts, then those still say they're continuing the work on Titan, with a view towards a 2025-2028 launch.
But it does change what makes sense to talk about in terms of "Apple" as it exists today.
Otherwise you might as well talk about why IBM is an undefeatable behemoth that dominates the industry...oh, wait, what's that? That hasn't been true for over 30 years now? I thought age didn't change facts?
You mean the company that is usually the champion on patents per year, owns a large portion of Linux, GNOME and GCC development, is the 2nd major Java vendor, and has had quite a good fiscal year, including growth in mainframe and micro sales?
A behemoth indeed, only HN isn't paying attention where it matters.