the only advantage over docker that I see is that it doesnt require the overlay fs stuff docker has, but the downside of this is that it doesnt keep its own state. It seems to use system state, such as any global configuration, caches, etc.

I prefer docker compose, simply because its fully reproducible, no matter where I am, and sets up all the tools it uses.

This tools looks like it still requires you to install your tooling - that screams like it will break if you have different distros you run this on, with different versions of tools, etc.