Core Audio is a set of programming interfaces (APIs) of the Apple operating systems macOS and iOS for real-time internal audio processing, as well as the connection and control of external audio hardware.
These interfaces provide a direct connection to the hardware abstraction layer on the operating system side, enabling the low latencies required for real-time capability. The developer is provided with a large number of frontend APIs (Audio Units, OpenAL, MIDI, AudioToolbox etc.) for use, the so-called Application Level Services.
It should deliver everything from ground up what applications require.
Windows didnt have this from ground up, so ASIO was needed to be able to give devices direct latency free access to the audio HW.
This doesn't exclude, that the implementation of ASIO under Windows now might be more performant ...
But it also means, that MacOS has its own way to handle audio because of a different kernel and audio architecture.
So in the Mac world you get Core Audio, and thats it.
You should perhaps make a side by side comparison by installing Windows on a Mac ... then you can judge whats better.
If in the past years no developer released an ASIO driver ... then it was either not necessary or not easily possible.
Or there was no market for it, because everybody at the end uses Core Audio ....
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