Apples and oranges.
Package managers only install a package with defaults. These helper scripts are designed to take the user through a final config that isn’t provided by the package defaults.
No need to be elitist about such things.
EDIT: this particular repo is highly regarded in the community. It is very akin to the AUR. It’s not some haphazard collection of scripts.
I’m not going to remove this post because the article does boast the virtues of self-hosted FOSS. Still, the article isn’t much more than an overview and does very little to educate or instruct. This is relatively low-effort and I hope the votes reflect that.