AI is never a substitute for the usage of the brain as long as you're not abusing it. It's artificial intelligence which practically means that it was never designed to function in  the capacity that the brain functions. A lot of brain work is pretty easier now than it used to before the usage of AI became rampant and all is supper to be to the credit of it. Of cause, there's no way AI can be smarter than mans thinking when it comes to real problem solving but for the aids it prefers, we have to appreciate the fact that it has made life pretty better than it was in the days.

Even after sourcing our information online, my brain always takes out what's good from what's not good even if the information is generated via AI. A lot of yh complex real life shit are being carried out by humans and till date, the percentage of the population of people that are yet to have access to internet and that are using AI is still much which still means that the world is pretty much modest in her reliance on information gotten from the brain.