I am not a Blizzard employee and don't have insider information. I'm just impressed with their improvements and hopeful it was at least partially enabled by their use of AI to help ideate, design and implement.
Blizzard has long been derided for its poor performance when handling massive player events, showing worse performance in that regard than large private servers such as Nostalrius.
The biggest technological advancement in the past couple years that could help explain their sudden and dramatic improvement is AI, in my opinion. I think it's fantastic if AI is indeed a large part of the reason for their rapid improvement.
Lets agree to disagree, happy to attribute llm wins where respect is earned but not more, to balance out various horror stories
Maybe making nostalgic experiences available so cheaply is not a good thing. For me seeing mods and reimaginings of old games are interesting because people puts lots of effort into them with attention to detail and their own ideas. Someone recreating Half-Life 1 with modern graphics using AI is not going to create something as cool as Black Mesa, for instance, which didn't attempt to make a 1 to 1 recreation but to improve things and make it fit with more modern graphics.
On a similar note World of Warcraft just launched "WoW Forever", a nostalgic throwback to vanilla WoW. Millions of people tried to play on the first day and for the first time ever during a major launch of WoW, everything went smoothly and players were able to log in and play without lagging out. Normally it took a few days after launch for servers to catch up to demand and allow people to actually play the game without lag or disconnections. I'm confident that AI played a major role in allowing Blizzard's team to navigate a WoW launch successfully for the first time.