Of course it produced some usable stuff, but not to the same degree. Take your example of expert systems: as far as I know, they never really took off. There were attempts, and I'm sure there was some commercial success, but it remained a small niche. Compare to deep neural networks today, which are driving sales worth billions and have huge resources from major automakers, and no doubt many others.

Is there a mismatch between the hype and the reality for the people funding this stuff? Certainly there's a mismatch for the general public, but they don't matter.