Homebrew manages 90+% of installations the the few that it doesn't do coming from the App Store or manual download and install. The rest of the work is simply restoring my config files and copying over data all of which is done via a shell script.
Windows and Linux (Fedora in my case) is mostly the same with just a little extra work on Windows to manually change some settings that never seem to stick if done another way.
Not saying switching to BSD is the wrong thing for this person but having used BSD in the past I wouldn't say it is any quicker to setup than macOS or pretty much any other OS these days. In fact with hardware issues you are likely to run into it can take a lot longer to get an equivalently working system. They even say how WiFi and Bluetooth still isn't as functional or performant as it is elsewhere so who knows how much time they have spent trying to sort that.
But as long as the author finds their environment works better for them that is all that really matters. However I feel when people throw out things like 'macOS took 3 days to setup' it weakens their argument as I know that is not "normal" so I wonder if perhaps they are just making up things to justify (to themselves) the switch. I see it a lot when people switch from Windows to macOS or Linux. People come up with all kinds of "reasons" as to why they are doing it and a lot of the time it is more emotional than factual which is fine providing you admit that rather than come up with nonsense claims.