IMHO you'd right to be sceptical because for me, it is only a slightly more ergonomic way to organise and run shell scripts. It's difficult to make the case it's much better but I found it interesting how "just being a bit nicer" for a common activity can be a really valuable quality of life improvement.

- easier - core benefit is making it nicer to implement multiple commands with arguments without inventing something equivalent in shell

- convenient - with "fallback" just will search up the folder tree to find the just command so I don't need to be in the right folder. I have justfiles at multiple levels in a project hierarchy and my cwd works as context to pick the right command

- polyglot - can use different languages as needed

- predictable - it's so nice when I return to a project and I have recipes for setting up my env, various types of build and test. The consequence of being a little more ergonomic means I capture more useful command lines that, for whatever reason, I would not have made into shell scripts because of the added friction.