It wasn’t collectively known that software was hard to do right at that time. If it always performed as intended it would have made for a less expensive and perfectly safe machine. It’s the textbook case in doing software wrong because there wasn’t one that happened before it.

Archaic hardware and software requiring downtime on the backend to do standard maintenance like backups, software changes, changing vacuums tubes, pulling moths out of relays.

As opposed to modern hardware and software architectures that allow for standard maintenance without downtime.

The existence of natural intelligence is the proof that artificial intelligence is possible.