It's simple, marketing dominates everything. With attention being very expensive, appearance is what matters.

It doesn't matter if you write fantastic library, nobody is gonna use it because they won't know about it, the one with a gif of the terminal (ffs) will win that has a good page describing what it does (and being the most popular one can even become better than your library because of the following but that's not the point here).

It's everywhere, products, hiring, services. We have no network of trust (sigh), we need to trust some heuristics based on a shallow information. If somebody focuses on the shallow he wins, because nobody can ever dive into everything.