Switching to a new programming language is very time-expensive, so I would really like to know the advantages of this language over C#, Java, Python etc. What is the motivation. Why not use something that exists, maybe Lisp?
Tracking of effects would be a big one; compare the number of sandbox escapes in Java to JavaScript to WebAssembly. It's much easier to secure a language without effects, and then slowly add the effects you can sandbox or control than to start with a large effectful language and try and slice bits of it off.
Programming can be a hobby and hence time-expensive doesn't mean much. A language doesn't necessarily have to be more productive than other languages from the very start.
