That's what caused the first "AI Winter": Rules-based "AI" engines became what we call "Business Rules". AI didn't go away - it just stopped being an over-valued set of if-then logic and slots (value-driven triggers) with a cool set of GUI tools to build rule networks.

Source: Used to work for an 80s-era "AI Company"

All of them. That's how AI works. Not by making smarter machines, but by destroying intelligence by smashing it into machine-digestible bits.