I worked at Valve a few years back, and I could write a book about what's wrong there. I think the biggest problem they have -- which the author of this article touched on -- is that "success is the worst teacher." Valve have discovered that cosmetic microtransactions are big money makers, and thus every team at Valve was dedicated to that vision. When I was there (before Artifact started in open development) there were essentially no new games being developed at all. There was a small group that were working on Left for Dead 3 (cancelled shortly after I joined), and a couple guys poking around with pre-production experiments for Half-Life 3 (it will never be released). But effectively all the attention was focused on cosmetic items and "the economy" of the three big games (DOTA, CS:GO, and TF2). One very senior employee even said that Valve would never make another single player game, because they weren't worth the effort. "Portal 2," he explained, had only made $200 million in profit and that kind of chump change just wasn't worth it, when you could make 100s of millions a year selling digital hats and paintjobs for guns (most of which are designed by players, not the employees!)

I joined Valve because I excited to work with what I thought was the best game studio in the world, but I left very depressed when I found out they're merely collecting rent from Steam and making in-game decorations for old games.