Hmm.. I dunno about being easier to work with. Digital is simpler to implement (less hardware) and is simpler to read as well. I think analog was considered a natural interface because it simulated real life in many situations. I'm sure that, in the early days, games were seen to mimic reality rather than create their own universe and rules, and so they would expected to naturally evolve into something more life like, realism, when the hardware matured to a certain point. And in a way, they were right (thinking of this point in time). There just happen to be a temporary diversion along the way.
But it is interesting to see games start out with analog controls as the standard input (late 70's, early 80's), then migrate over to digital controls (gamepads), and then back again to analog when 3D generation picked up steam (PS/Sat/N64).