Darkest Dungeon, Jedi Fallen Order, and Titanfall 2 are all super cheap. Darkest Dungeon pissed me off 15 hours in or so, enough to ragequit the game, and I'd still consider it well worth the current price.
Disco Elysium and the original Hades are also great buys at 10€.
Zero DRM isn't the only reason games aren't published on GOG right away, and that may not even be the main reason for the countless games that release day one without Denuvo.
GOG also doesn't have the best infrastructure for pushing updates. Stories abound of it being a slow process, whether physically uploading the files or authentication taking a while. Invariably, game updates will show up later on GOG than they will on Steam. GOG also has a very consumer-friendly return policy. All that, combined with it being simply a smaller marketplace, doesn't place it well in cost-benefit analysis.