In their defense, if you don't already have a pretty good idea of the "why?" from what is on their homepage, you're not going to be a Cray customer anytime soon and you're unlikely to find yourself working for one.
In your defense, maybe if they cared about mindshare and community beyond the people who give them money, enough people would have given them money that they wouldn't now be a subsidiary of HPE.
I never could figure out (2000's-era) Cray. Their office was in my neighborhood and a friend-of-a-friend worked there and it sounded like interesting work, so I checked out their jobs page. Almost all of the jobs were sales, and their most junior engineering position required something like 10-15 years HPC experience.
I've seen successful niche technical industries (Fluke comes to mind), and Cray didn't even look like a niche industry. It looked like a dying one.
In your defense, maybe if they cared about mindshare and community beyond the people who give them money, enough people would have given them money that they wouldn't now be a subsidiary of HPE.