It was my understanding that preflight would not support MAC OS, since it's not spelled out as one of the official OS's that the certification process supports. Did this change?

I had a report from a partner that this was desired. I'm obviously open to discussion.

@acornett21 is correct, at least, as I last understood it. The goal was to provide the Linux binaries, and the container images for Preflight to be used more widely.

CC @jomkz to chime in if we need to adjust our stance here.

Preflight does work properly when built on macOS. I do so myself so that I can use it locally, albeit only for testing.

We publicize in the OpenShift docs that the full suite of tools for operator development are available for macOS, and we also have OpenShift Local/CodeReady Containers available for this platform (but only for Intel due to reliance on RHEL 8 which can't run on Apple Silicon, even virtualized [RHEL 9 is okay virtualized]), so we should at least consider having Preflight built for macOS.

I build them myself too, it would be nice to have official binaries and maybe even be able to install them with brew...