I just searched it, straight from playstations website:
https://direct.playstation.com/en-us/buy-games/god-of-war-ragnarok-pc
“Do I need a PSN account to play PlayStation games on PC?”
“No, you currently do not need a PSN account to enjoy PlayStation Studio games on PC, but you will need a Steam account to redeem your voucher code. Some of our PlayStation Studios titles also offer incentives for linking your Steam and PSN accounts.”
Edit: Their website could be outdated, or incorrect? I just swear I saw an article title that Sony removed the requirement for PSN for Ragnarok PC.
People like that CS doesn’t change. It just eventually gets visual upgrades with new engine versions. You can hop on CS, and know the exact game play you’re going to get.
Also, custom CS servers for extremely different game play are a thing.