Earlier quoted context omitted.
For me the biggest ones are: 1. Compilation is ridiculously fast. 2. The language is miles more intuitive, and doesn't require nearly as many hacks. In a handful of hours using typst I've written much more interesting things than I ever would've attempted using latex macros. This might be less important for you, but my latex usage is intermittent, so I've always forgotten it by the next document I write.
And do the intuitiveness and speed not come at the expense of some expressive power limitation?
E.g., during the preview I built a very basic CAS with it, for simplifying and differentiating simple math expressions, in the span of an afternoon.