Hi Markus! Thank you for your response!

I like that definition, too. Although it doesn't cover all the spectrum. If an AI system is better than people at recognizing faces and we keep improving it, it's still AI but it doesn't reflect this definition.

About understanding intelligence, that's a hard quest. Even if we build AGI sometime, it doesn't mean we'll understand intelligence. AI is at a significantly lower level and we already don't fully understand how neural networks work so well. Deep learning is unreasonably effective.

Cheers :)