The laws of physics work differently in the electronic world than in the real world. In the world of computers, you can have a toilet bowl tranform into a shower head on-demand, without "spillage" across functions.

Thats what the Finder toolbar is, or the Ribbon, or the smartphone.

Seems to me that both Steve Jobs and Gates understood that, but maybe the difference was in their top lieutenants buy-in of the same thing.