@david_chisnall
Maybe just AI's are not yet as intelligent as it is wanted/believed now.
Lawers speaks natural languages on daily life (except their jobs).
Mathematitians, engineer, scientists, too. They/we are as intelligent as use both natural and "job" language in their/our area of professions.

And at least currently, I don't think the way currently used (mostly deep learning, I guess) for AI's alone is sufficient. More researches for "intelligense" would be needed.

Years ago, neural network was the target. Currently, deep learning. So the next is...? I don't know.🤷‍♂️