I think the team size grows with open-world multiple storyline type games like Oblivion/Skyrim. I haven't played CP2077 but from the sound of it, it's in that realm. They have a core group that programs the actual mechanics, physics, play - but then separate teams create content missions and bosses (and boss fights). That's where the spend is. And a lot of people can play these games for a really long time because there are a lot of different side missions. ... and eventually DLC.