I am shitty at shell scripting, so I often use other people's scripts from the internet with some minor tweaks. I've also put a lot of time into learning the nuances of zsh so there is also a lot of the sunk cost effect going on.

Also, and this is an assumption, I think other shells just have a lot more online resources you know? I have not yet found any problems or ideas I've had that someone else haven't also had and solved.