It seems simple. Maybe too simple for some to grasp. Taking the complex and making it simple is the mark of a great communicator. How ever it does require an open mind to process it. Those who pride themselves as so intelligent often don’t grasp simplicity.
Ha! Yes. While there is very often a place for complexity and high logic, sometimes it fails. The last "S" in "KISS" is not directed at someone who performs poorly on an IQ test.
Of course, as too often seen here on FR, your statement could be reworded: "Those who pride themselves as so intelligent often don’t grasp their own arrogance." If one tries to even gently point out to an arrogant person that they may be taken that way, they will just double down on it.