Exactly. A "try language" demo should dive right into an editable executor with syntax highlighting and API-docs floating tool tip code completion. Make it as painless and fast to understand as possible.
Printing hello world is the default of the industry for this sort of thing.
The Rust playground defaults to "Hello World" but that's just because there has to be something there, it's not on the home page of the website or anything (though it used to be).
Mainly my point is it’s weird to complain about hello world. It’s been the first program for languages for decades.
You also don't get to be the chief decider of what all of us may or may not talk about.