Ouch. Why do you think that, because of the syntax?
Well, your'e probably not getting to the point of using Slim.
It's not an angular replacement, It's competing with vue/react/backbone and such.
Why? Other than self righteous claims that it is better, there is no actual comparison. Add to that the return to object-oriented, internal-state-driven data management, the implicit magic, plus the indignation of the author, and we have at best a new Backbone. Which the community has moved on from.
You're right, I'm not getting the point, because you're not making one. You may have made a cool thing, but everyone will dismiss it if you immediately make claims of it's impending dominance.