Agree but I'm not sure why. I'm not a mac user so the initial impression is like "this isn't for you, go away". At least add a linux command alongside it!
Even on macOS, brew is wildly inferior to MacPorts; to be fair, brew is “blessed” by Swift Package Manager whereas MacPorts is not, but this is ironic given the guy behind MacPorts both worked at Apple and designed the original FreeBSD ports system.
That's the very weird thing about the little universe within Apple's macOS, there are pockets of very high quality here and there, next to "what the fuck are you guys even doing?", and a Unix core that's been effectively bastardized, abandoned, and frankenstein'd
Instead of Compton a short ride from Beverly Hills it's like the houses from those two wildly different hoods all stacked in a repeatedly alternating sequence.
I think the overall quality level on Macs is leagues above anyone else, even the UNIX stuff (I personally prefer the BSD utils to the GNU ones, which pretty much anyone else running POSIX stuff is using unless they’re daily-driving an actual BSD.
I just don’t get why Apple would hire Jordan Hubbard for their UNIX team, see him implement a very well thought out version of the standard package manager of all time that he also wrote, and then decide to use brew as their blessed package manager for their various open source releases, .systemLibrary in Swift packages, etc.
Kubernetes only runs on linux, so it follows to reason if you care about k8s you should care about linux. My experience is also that good experienced sysadmins often use linux for their own machines as well.
Targetting a tool at macOS users, and omitting linux instructions, gives the impression that the tool isn't targeted at sysadmins or hackers (i.e. at us), but rather at beginners, frontend developers, etc.
Saying it's targeted at beginners because it supports MacOS shows a lot of disconnection with what many DevOps people use these days. The year of the linux desktop has yet to arrive, and Mac is king for people in IT (at least in the US)
I have yet to meet a competent sysadmin that cares much about "desktop", and to the extent they do they mostly seem to invent their own graphical tools, with Tcl/Tk and so on.
Most, however, do not, nor should they be expected to. Homebrew is not a safe or viable package manager, especially when better and safer package managers exist in the Linux ecosystem.