If you think there's something obvious that has never ever been discussed, chances are extremely high that you are ignorant of discussions that have already taken place.

Whether the problem has been discussed, and whether it has been resolved, are two entirely different matters.

The nature of general intelligence has been discussed ad nauseam, but we've been extraordinarily unproductive in defining that property in humans, much less working out a reliable way to measure it, and we certainly haven't made much progress in reproducing it.

Hardware power has increased steadily. Has development in software kept pace? Why do you think that is?