Compared to other Javascript libraries, it's not that bad, I was just hoping for a second that "extracted the render engine" meant something really lightweight,

Compared to other Javascript libraries, it's not that bad, I was just hoping for a second that "extracted the render engine" meant something really lightweight, i.e. something you could just include as a script tag for lightweight use (like "sizzle", back in the days). It's still going to be worth a look, as I don't mind opinionated stuff for some mid-sized SPAs and tools, I'm just missing a tool for the lower end in my belt these days.