I can't speak for the person you're asking, but BSD is worlds easier than using Linux. A how-to for FreeBSD can be used with NetBSD with minimal changes. Why?

I can't speak for the person you're asking, but BSD is worlds easier than using Linux. A how-to for FreeBSD can be used with NetBSD with minimal changes. Why? Because the BSDs don't expend effort to deliberately try to differentiate themselves from each other. They're consistent and don't change gratuitously. Try writing a how-to that has even the slightest consistency between the common Linux distros - Red Hat, Ubuntu, Debian, Arch. Heck - many how-tos written for Ubuntu 18 can't be used with newer Ubuntu! It's a mess.