Assuming the compilation is perfect, it lets the author maintain the simple Just format, while simultaneously distributing the same code to a runtime (shell) that is installed everywhere. Lowers the barrier of entry. Also, my quick glance at the just.sh output, it introduces a lot of niceties most people are not going to include in their own shell scripts.

I love Just. Corrects many of Makes hindsight-mistakes, and centralizes all of your project tasks for an easy to browse summary. Even if each task is essentially `bash scripts/dothing.sh`, the single source is nice.