This is irrelevant. You may be just a new comer, or not a professional developer, and still want to use yarn. A clear website seems a basic requirement to me for any project.
Let's take a look at GNU tar [1] and GNU social [2] webpages as examples. The first thing they tell a user is what the project is. I would say, both of them are order of magnitude better than the yarn homepage.
I don't know where you've been but anyone who is even remotely invested in the npm ecosystem probably knows what Yarn is at this point.