I regret not going with bash or even sh when I had the chance. Nothing beats that for ubiquity and getting shit done.

Go is behind, specifically, you have no guarantees that a given machine has Go installed, and doing stuff like gluing commands together, inspecting some files, pipe output around, or automate the boring thing in 30 seconds.

Sure Go beats bash or sh when the thing you are doing starts to become real software, but that is a problem that sits between the chair and the keyboard.