Yes, that's something i have to accredit, Tim C. managed to optimize the production pipeline (whip-whip-whip) and outsource even more to China. Yeah yeah America first! ?
To me that's still resting on Steve Jobs legacy, product wise.
The Apple Watch is the only successful product that might have been partly made under his leadership, but probably raw concepts was done earlier by S.J., too.
Iirc he left a multiple year plan with products to safe the future of Apple.
He died late 2011, the Apple Watch was released 2015.
M1 just falls under logical Apple CPU evolution to me.
Apple keeps flip/flopping hardware design, because they are running out of creativity, too.