That, and while Sony had all these big groups they often didn't play nice with each other. Look at how they failed to make Minidisc into any useful data platforms with PCs, largely because MD's were consumer devices and not personal computers so they were pretty much only seen as music hardware.

Even on the few Vaios that had MD drives on them, they're pretty much just an external MD player permanently glued to the device instead of being a full and deeply integrated PC component.