This is an extremely selfish answer - by refusing to spend a few hours writing a front-page summary of your language, you're valuing the time of your m developers (where m is small) over that of the n developers who might want to evaluate the language (where n is large).
A language made by people who consciously make that tradeoff is almost certainly not worth even trying to learn. At least, if you're looking for a language that will actually act like a force-multiplying lever and save you time. Like, you know, programming languages are meant to do.
This is a gift to the world, so they aren't selfish. You are demanding, and you have no right to demand anything of random strangers on the Internet. Nobody is required to market their work as you demand, or even try very hard to seek new users. Often, slow growth is better.
Maybe someone not on the team will write a decent review of the language, and we will find out more. Hopefully that person will read the documentation and actually try out the language.
> You are demanding, and you have no right to demand anything of random strangers on the Internet.
In which case, the developers of this language are demanding that I spend my valuable time trying to read through their documentation to figure out if this language is good for me, in which case I reply: my time is also a gift and you have no right to demand that of me - I'm going to go and look at another language, and suggest that friends and fellow developers do the same.
A language made by people who consciously make that tradeoff is almost certainly not worth even trying to learn. At least, if you're looking for a language that will actually act like a force-multiplying lever and save you time. Like, you know, programming languages are meant to do.