Thankfully the NTSB and other accident investigators do not usually come out with a single easy cause in a newsbite size. They will examine lots of contributory factors, and they will come up with suggestions that fix those - typically dozens or more. In aviation they talk of "swiss cheese" theory - slices of cheese with holes in them. The idea is to have many in such a way as holes don't line up.
As you say, a failure like this is not "pilot error" but rather a failure of the aviation system and that is what needs to be corrected for all aviation. The "pilot error" is a symptom of the problem, not the cause.
As you say, a failure like this is not "pilot error" but rather a failure of the aviation system and that is what needs to be corrected for all aviation. The "pilot error" is a symptom of the problem, not the cause.