Here's a few points:
- The syntax is a lot lighter and easier to type fast. I was up and running in half hour after starting to use it. Once in a while I can look up some symbol name in the docs but that's about it. I can type math notes almost at the speed of writing by hand and my right pinky doesn't fall off because of all backslashes and curly braces.
- Empty document is a valid document. No preambles, no includes etc, it's all optional and the defaults are sensible. Just start typing.
- It's incremental. Live preview from neovim is in the browser and it's lightning fast, pretty much immediate. No pdf sync pain. No build files, makefiles and all that. Just start typing.
While it's not going to beat latex in terms of serious academic use, for personal use and notes it's close to perfect.
(And of course it's written in Rust...)