Earlier quoted context omitted.
Nowadays that would be Windows Server Core with WSL, which unfortunely isn't yet supported.
Interix was so much more orthogonal to the design of NT-- so much more elegant. WSLv1 was more elegant than WSLv2. WSLv2 feels like a minor step up from just running a Linux VM.
See the usual complains about macOS not being Linux, from people that probably should be supporting Linux OEMs instead of buying Apple laptops.