People live under the delusion that OS X was "100% new" when in fact it was warmed-over NeXTSTEP from 1989. Most of them probably have never seen or heard of a NeXT workstation.
To reinforce how much people hate "100% new" how long has Microsoft been working on ReFS? 20 years? The safest most boring job in the world must be NTFS developer.
The OS X story is even worse than that. When Apple first released OS X to developers, like Adobe, they balked. They weren't going to port their Mac applications to this "new" operating system. Apple had to take another year to develop the Carbon APIs so Mac developers could more easily port their apps over.
To reinforce how much people hate "100% new" how long has Microsoft been working on ReFS? 20 years? The safest most boring job in the world must be NTFS developer.