I mis-phrased that, sorry. In the Android case, you can’t access a lot of networking functionality and other lower level access functions.
Running ifconfig responses with:
Warning: cannot open /proc/net/dev (Permission denied). Limited output.
Even though it is based on Linux, and has access to the ifconfig app, it’s not really something you can do. There are other things to consider like that. While you could try to give yourself root access, it’s messy and not something that’s really easy or encouraged.
In macOS’s case, it’s Unix to a point, but try installing NVIDIA cards in them (for CUDA cores). There are Unix drivers for Nvidia cards, for x86 and ARM, but even thought it’s Unix, it still won’t work.
How about running native Vulcan? It’s a major API for 3D graphics. It has a Unix driver, but still can’t work on macOS. Best that can be done is workarounds, but that’s not native and has issues.
There is Unix support for these, but macOS isn’t really Unix underneath.
Vulkan has hacked in support, but not official support. It’s like saying that because I can hack in Flash on macOS, that must mean that it has tons of support. Two different things.
And macOS is Unix certified, but that doesn’t make it Unix (I know, it’s complicated…) To help show this, EulerOS (from Huawei) is a Linux OS.
Its was also Unix 03 certified, just like macOS. Even though it’s Linux, not Unix.