For a very long time Artificial Intelligence programs were using pure logic based bruit forcing. They managed to do lots of cool and useful stuff with that. However, with modern big data we need less rigid approach to make decisions, because we need huge amont of processing power to bruit force a probability tree and sometime it’s practically impossible.
That’w when we need a AI with approximated human intuition rather than strictly logical AI. In other words a Kirk rather than a Spock.
The estimated time frame was around 2030 for us to build something like that. Fun fact! We have one now and that is AlphaGo built by DeepMind, a Alphabet company.