In the places I’ve worked I’ve found open plan workspaces encourages collaborative working and reduces barriers between departments. The company I work for now are in the process of merging departments into that sort of working as our business behavioural consultants believe it improves productivity. I suppose again it boils down to opinions differing and different methods of working.
One thing is for sure, nobody in this thread is qualified beyond our own experiences to determine whether Apple are right or wrong here.