Define 'extensive training' on these particular items. It was given a large corpus of data, and a relatively limited amount of "yes that's right/no you're wrong" on the answers it is formulating.

But even beyond that point, you have to take a bunch of human time to train an individual those things you're talking about, and then they quit, or get hit by a car. Already GPT has a far larger corpus of information than any individual can hold. It won't quit its job. It can be backed up and restored. And every 6-12 months the systems are getting better.

It's not a fair comparison at all, humans just keep sucking under those constraints.