in a way that people think to be very intransparent, undemocratic.
Of course they call the shots. But you can do that in various ways.
Go to github, look at the tickets, look at the PRs, look at the discussions. How is that intransparent. And, no, just like science FLOSS is not a democracy, and wikipedia is not a FLOSS project they're a bunch of dictionary editors paying people to work on mediawiki, the software that runs the site.
Look at that massive list and then switch from "enhancement" to "bug" and possibly understand why some of that stuff might take some time before it gets addressed.
Look at the massive amount of pull requests that get merged, authored by a gazillion of different people. None of them from beehaw.
popular
Is generally not how software development works. If you always do the most popular thing first what you end up is with a lightyear of duct tape holding together an abomination of technical debt. Also, to paraphrase Henry Ford: "If I had asked people what they wanted I'd have bred faster horses".