That sounds awful to me. I spent maybe 1 or 2 days reading the woolidge bash guide, and the Dylan araps bash Bible and now I have that skill forever. Sure I spent more time practicing but I can craft exactly what I want without even thinking about it. I value that knowledge. Use shellcheck and the bash lsp and that's it.
But they way you talk about makes me feel weird. It honestly sounds a little insane.
If we're going with anecdotes, I have learned Bash scripting and zsh scripting separately at different points in my life. Both times I forgot it very quickly. My guess is that you value that knowledge and that helps you retain it. Practice of course helps.
For me, my primary shell both at work and at home is xonsh, which is Python-based, and 90+% of all shell scripting I do is in Python in that shell. Having that knowledge of Bash is not even worth 2 days for me. If I were an embedded developer or a system administrator where I often have to SSH into accounts I don't control I could value Bash more but that's not the case for me and a fairly significant percentage of software engineers. Why spend a few days learning it when I don't need it? Even in the example above, I did it for my convenience, not because I needed it.
That's not what I find insane though, nor is it what I said. The fact that this person is willing to sink in a ton of time iteratively coercing an LLM to spit out something that they themselves admitted had negative side effects, and didn't work that well, and describing it like hounding a personal employee in the name of "productivity" is like 7 layers of insane to me. All to avoid spending, probably less, time learning. Like I'm baffled at what motivates people who are like this. It's gotta be money right?
But they way you talk about makes me feel weird. It honestly sounds a little insane.