Are you a Mac user for the hardware? If not, why not stick with the stock OS?
macOS is awful and OpenBSD is a lot more stable, reliable and secure.
Oh? I had a lot of positive experiences with a Mac...and isn't the userland OpenBSD anyways? :)
The issues with macOS are Apple's ability to track and control your device at will without user consent. There's many other issues.
Have thought to do the same with a 2013 MBA. Wondering if the third antenna can bring it into AC1900 spec.