Just picked up a 2008 MacBook with Snow Leopard (10.6).
I can confirm all (95%?) the features I've grown to love about macOS and regarded as innovative human design are still
there.
Edit: I do however think iOS has been steadily improving, with some mild-moderate missteps. iOS 8 on my first 5s is a far cry from iOS 13.3 on the 11P. For comparison Snow Leopard was 2009, iOS 8 was 2014.
I can confirm all (95%?) the features I've grown to love about macOS and regarded as innovative human design are still there.
Edit: I do however think iOS has been steadily improving, with some mild-moderate missteps. iOS 8 on my first 5s is a far cry from iOS 13.3 on the 11P. For comparison Snow Leopard was 2009, iOS 8 was 2014.