Make is a wonderful way to provide a standard set of entry points into working with repos. For instance, if you can standardize on `make setup`, `make test`, `make docker`, etc. on all of your organization's code, it's very easy for a new develop on a project to start contributing quickly. You could do that with shell scripts, but then you have to re-implement all the command line parsing that make gives you for free. And with justfiles, you can have something that looks and feels like make, but with a more pleasant syntax for non-compiling jobs.
IMO, Just is to make as zsh/fish are to bash. It's not ubiquitously available, and it's not 100% backward compatible, but if you can convince your coworkers to adopt it as your standard, it makes life that much easier for everyone.