I see it as overspecialisation. When GTA 6 costs 10 years and a billion dollars, it needs to be an unmatched hit. But what if it's just bad on a conceptual level? More money can create more models, textures and 'content' but it can't create fun. For GTA 3, it would have been a setback for a year. For GTA 6, it could be fatal.
I remember reading Bullfrog would take the engine from their last game and build a prototype to play to see if it was any fun. Then they'd throw it away and start over.
