I think the main thing we are seeing here is hundreds of smaller fixes that usually form the steady stream of Airworthiness Directives that an aircraft currently supported by the manufacturer sees turning into a news event every single time one comes out.

So far only one "aircraft" has had perfect software, and that was the Space Shuttle, every single other aircraft out there has had software issues that are worked out over the life of the aircraft, just like every piece of software, even that which has very strict testing regimes, has had defects in it.