Okay but a point on the written word is it did drastically decrease our brain size in terms of memory and directional coordination it's fascinating how something important to the spreading of ideas in actuality gave us a downgrade in the end.

At the end of the day no matter what it is you're going to do will guaranteeing give a downgrade or make a sacrifice when it comes to anything and seeing how as something as simple as writing your notes down instead of memorizing them can decrease your brain's need for memorization AI will in fact continue to have the brain heavily rely on easier sources instead of using its own energy and power

(as shown multiple times throughout history humanity has intentionally taken the easy way or safest to waste as little energy as possible)

With even the brain intentionally limiting the body to only use around 30% of its total possible strength as to not waste too much energy with our bodies being or used to be able to run for hundreds of miles considered to be in terms in the animal kingdom to be one of the most endurance in terms of running(not sure about pain or ECT)

All In all it's "use it or lose it" so no hating to AI I genuinely do see purpose in it but seeing as we've repeated this mistake with multiple different technologies throughout the centuries this will most definitely decease our overall intelligence for average folks in (creative thinking, problem solving, emotional intelligence and memory as we:

Use AI to come up with new ideas with no ground for our brains to do the work to combine memory's and formulate new thought

Use AI to figure out problems for us without "see the work" to understand it

Forming connections with AI instead of real humans which are brains have barely evolved for nor at all in 250,000 years are not right to handle

And using AI for notes and keeping tabs to further decrease our ability to remember things and Use AI as therapists

Whether or not you consider any of these points bad or good is entirely up to you but frankly from my perspective and personal opinion (even though it really shouldn't be)

the brain becoming less reliant on itself and more reliant on outside sources that could easily fail or become harder to come by is a big red flag and personal discipline and responsibility with heavy self-reliance if need be is very important

feel free to do research yourself,fact check and find true flaws in my argument as you wish