Statistically speaking, you can expect a cluster of changes in any complex software system of this age. One only needs to glance at the bevy of changes that IBM enacted in the OS of their mainframes... After about 25 years of operation.
What needs discussion - and discussion that doesn't degrade into an Airbus vs. Boeing slugfest - is whether or not there are little-known flaws in Airbus flight laws.
Again, statistically, it takes many years and numerous operating hours for these pernicious little bugs to reveal themselves.
Referring back to IBM, there was a tiny, insignificant code error in the 360 Operating System which would overwrite some data which had been archived. When it was discovered, IBM had to basically "ground" the operating system until that particular code error could be fixed.
Don't read this wrong - I'm not suggesting that any Airbus needs to be grounded.
I'm simply saying that, given a few recent incidents, maybe they should be looking at their code.
Perfect never, ever happens. But maybe they can refine and research a bit.
Statistically speaking.
Not a pilot, not anti-Airbus. Merely saying that a complex system might have flaws that only reveal after a large number of operations.