Apple was always been like that, they just used their newly NeXTSTEP based OS to sell themselves to the UNIX crowd as a question of survival.
Copland didn't had anything UNIX related, and BeOS just had some kind of minimal POSIX support, as it wasn't their goal to be a UNIX clone anyway.
Copland having been a success, or going BeOS instead, are two possible not taken paths that would have given a very different outcome.
Apple was always been like that, they just used their newly NeXTSTEP based OS to sell themselves to the UNIX crowd as a question of survival.
Copland didn't had anything UNIX related, and BeOS just had some kind of minimal POSIX support, as it wasn't their goal to be a UNIX clone anyway.
Copland having been a success, or going BeOS instead, are two possible not taken paths that would have given a very different outcome.