Whether you're a gamer or not, what #grindinggeargames has accomplished with #pathofexile is extremely noteworthy. With the recent patch, 3.26, they've seamlessly integrated a massively complicated new system of mercenaries, who have their own abilities but can be kitted out with gear however you choose, into a game that was already notorious for its complexity. All while continuing to smooth out some of the rough edges.
One thing I am absolutely certain of is if we reviewed their development process and cycle, we would find that they are integrating feedback into a tightly-iterative process to a degree that most software firms will frankly never be able to attain. I think anyone who has a passing interest in quality should be getting extremely curious about how they have managed to consistently deliver incredible experiences. Particularly when they absolutely have some releases that land like a wet turd and they mitigate, correct, and learn from to a degree that you just don't see from other software companies.
I only have the totally outside view here, but whatever processes they have designed are more effective than just about anyone else in software design today.