Agreed. The number of language projects that don't even have a basic example of the language syntax on their home page is embarrassing. It's like those articles about new astronomy pictures that don't include the actual pictures.
Flutter is pretty egregious, lots of links, zero examples. It took me forever to determine it is a native runtime platform for mobile Dart applications. They wouldn't even admit that very easily.
Good: https://golang.org/
Bad: https://flutter.io/ (it should have at least one screenshot, and a simple example on the first page)