Neither of those classes of user has the expertise to avoid picking "the weak algorithms."
My own shell scripts are maybe more iffy, as I am not myself an expert, but my personal use doesn't see wide distribution.
Personally, I'm of the opinion that APIs should be as misuse-resistant as possible, and GPG is notoriously intransigent about actually acting as a well-designed API. Additionally, The Update Framework (TUF, https://theupdateframework.github.io/) prevents these issues by design.
Importantly though, it's a big project which in this specific instance meant that someone on earth did end up scrutinizing and publishing exactly the sort of thing you linked.