May be true for some that just float along in society on that kind of route, however in this era of the knee of science and technology for many that apply themselves, it will have the opposite effect of being able to cope with the increasing complexities of technology and science. I here in Silicon Valley have been up to my neck in all that continual complex change all my adult life. Have a huge advantage over most of the rest of you doing many things because of what I've fed in and done. That noted, I do shield myself from polluting and cluttering my mind from a list of things most others absorb as though it does not matter. One reason I watch so little tv, don't read political news, don't ever view porn, watch few violent or horror movies, play few video games, and often don't in public carry my smartphone around.
The old narrative of being relatively stuck with skills and knowledge levels dominated by innate IQ, has been demoted and today it is much more about neural plasticity. We are what we experience and do. If one wants to become skilled or knowledgeable at something, it is a matter of making an effort to educate, learn, using, experiencing, and then via repeating, connections are increasingly built in one's brain. Spend a lifetime building up such and it is amazing what is possible for the human brain.