Recently the Homebrew team decided to drop support for Intel Macs. So the `brew` install ignores older but perfectly useable Macs. On those boxes, `sudo port install moreutils` should work.
I'm not sure how requiring sudo to install new executables is bad for system stability.
For using Unix tools in native macOS workflows, ports systems like homebrew, macports, pkgsrc, etc. are a decent option.
In my dreams this might breathe more life into homebrew alternatives for macOS. (I also wonder whether some of the port systems for BSD and macOS could/should be unified.)