Make can't (at least that I've seen) enumerate it's own commands/targets. Yes there are recipes that you can cargo cult into your make file to do that using sed/awk but natively it doesn't have a way to enumerate it's commands/targets.

By the logic that since make exists, and can do everything, then we really shouldn't build any new command runners. Since C exists and can do everything we really shouldn't use rust, zig, java, python.

Make is great, I've used it for nearly 30 years now, and it's really good at certain things, but it's not particularly good as a generic command runner. It's difficult to debug, it requires a lot of extra boilerplate text to be an ok command runner.

Just is a more ergonomic tool than make to use as a command runner, zsh is a more ergonomic tool to use as a shell than sh.

Yes make, when combined with some other tools like sed/awk can do everything that just can do, just not as easily, and it definitely requires a lot more depth of understanding to write a well formed Makefile than it does a well formed justfile.