The iPhone and services that go with the iPhone (music apps iCloud) together make apple what it is even today. The numbers are huge and the iPhone 17 and 17 Pro are still the gold standard of smartphones. Everything else is probably secondary support hardware and software for the iPhone.
I plan on moving away from macOS (maybe Asahi on my old M1 Air but leaning towards Arch on framework) but every attempt to reconsider the iPhone for me has failed.
The biggest thing I see is how the iPhone helped fuel social media and in turn social media helped iPhone with sales. The phone is a social and secure device and the iPhone excels at that thanks to iCloud services and the ease with which you can manage the phone. Upgrading is so seamless, managing Photos with iCloud is a no-brainer. Everything about it screams social and it does it extremely well.
The personal computer vs Mac war is still ongoing but android vs iPhone war was over years ago. The iPhone won and there is not much anyone can do at this point to compete at that scale unless someone comes up with something truly extraordinary rather than just putting LLMs inside apps.