To me, the most interesting aspect is the Unison language, specifically how it does away with code-as-text, and instead uses a structured database, so one is dealing directly with the AST: https://www.unison-lang.org/docs/the-big-idea/

(It is not the only language to do so - see old.reddit.com/r/nosyntax)

I hope this catches on, because parsing strings of text is a monumental waste of complexity.