The primary reason why I haven't bought a Pixel and switched to GrapheneOS is because Samsung's OneUI is just so far ahead of the curve. They innovate new software features years before anyone else does.
And something that Apple has been doing generally from Android (while trying really hard to catch up) - feature after feature and shamelessly releasing it as the next biggest revolutionary thing since the moon landing, or an invention shadowed only that of the wheel and fire.
In fact last few years of Apple's phone advancement has been nothing along with some features which has been Android for years. Or maybe that's not "copying", that's bringing "at par" which is of course different?