Can it do things that existing tools build into my distro cannot? It looks to me like a convenience tool. Which is fine, but i see no need for it myself

Probably not, that's what makes it so lean (it doesn't really pull in anything).

Although i have a feature branch with a tray app (for macos) that let's you monitor and track any process (will send notifications when one goes up or down). But it's just gimmicks i felt i needed to make life a bit easier when working with compose and across worktrees

That monitor sounds interesting; I manually set something up in Keyboard Maestro to notify me that something quit and potentially re-launch it.

Have a look at this issue, and the picture i posted. Their is an explanation on how to test it out locally if you wish too

https://github.com/raskrebs/sonar/issues/15