I can tell your from personal experience that being stupid does not feel good especially when you know it. You never "get it" when others talk, you never have anything to say, you are always saying and doing the wrong things, or not doing what should have been done.
I do agree there's a lot more to enjoy. One is not critical and cynical. I like a lot more people, food, music than my smarter siblings. I am very happy walking in parks, looking at trees, or petting animals. Life is simpler.