It's the dependence that many fear...
As technology advances, people's dependence upon it grows. This usually results in a proportional decline in skill sets considered "basic" by previous generations.
While certain skill sets might seem obsolete (like changing a car's oil or rewiring a lamp) AI encroaches into the realms of basic decision making and learning through experience.
Think of the humble "crock pot" for example. When introduced, it was a marvel specifically because it "took the thinking" out of cooking. By no longer requiring the cook to constantly monitor temperature, it "freed" the cook to stop thinking about cooking temperature altogether. Now, cooking a pot roast was no longer about observation and experience, but instead was a matter of turning a dial to "pot roast" and coming back in a few hours.
The latest generations of slow cookers go even further, having the ability to make "assumptions" and adjustments on their own. If a cook puts too much or too little water in the pot, it can be programmed to "know" that and to compensate by changing the cooking time and temperature.
Again, as with AI, all these things have to be programmed initially by humans...but because users no longer have to think about them they are inevitably forgotten collectively...to the point where many household cooks could not make a stew or even rice in a regular pot on a stove today...
Consider all the things that AI can be programmed to think for us today, then project that a generation or two down the road...what else will humans collectively forget to do for themselves? How might those forgotten things impact our ability to interact, face adversity or our concept of self sufficiency?