Chicken and egg problem. People use sh/bash because it is everywhere and standard. Requires energy to justify using an objectively superior tool if it is not default installed.

I would love if I could count on Just, fish, ripgrep, or any other multitude of tools that improve upon these CLI apis that were invented ad hoc and ossified in the 70s. Paved a lot of cow paths.

Perl is everywhere, standard (there is a single implementation, with a strong culture of backward compatibility) and an objectively superior tool.