About 10 years ago when I worked at Jagex, the creators of RuneScape, there was a sci-fi MMO project (basically sci-fi RuneScape) happening. I didn’t work on it, but a lot of people did, for 2-3 years. It was cancelled before release, I think because it just wasn’t fun enough. When you see a sunk cost like that or Titan (which notwithstanding the Overwatch pivot cannot have been cheap), you get a sense of how hard this is to get right.