Comment by torginus

In terms of practical usage, imo it doesn't matter whether macOS is Unix - it's certainly not Linux. The shell is different, the bundled utils are different, the filesystem, configuration and tooling is different enough that if you try to run anything beyond the most basic scripts written for Linux, they will not work.

Which means macOS is a separate platform you need to learn and support.

By this standard, WSL2 is much more Linux than macOS.