Seems a decent approach for people already up to speed on Go language/tooling idioms.

Bash is definitely archaic, but personally I find it fairly sane and productive despite that. There's tolerable archaic and there's run-for-the-hills archaic.

Speaking of the latter, it's aversion to the ordeal that is getting anything done in the Windows Batch language (cmd.exe) that would drive me to seek out a nonstandard tool like mage.