Ah, the great debate of clarity—it certainly is not a simple answer. Despite what the retort suggests, the original essay was never trying to come to a single answer, rather it was an inquiry into a complex question. When Nikhil asks "what is it that fogs our minds?", they are by no means suggesting that there is one single answer, but rather that it could be a combination of many factors. Furthermore, the essay was reflecting on the power of our brain's capacity for problem solving rather than discounting its potential.
Therefore, urRong to assume that there is only one answer to why our minds can't always be in a state of clarity. It's clear Nikhil understands that it's likely a combination of many factors and wasn't suggesting otherwise. It was a reflection on the exercise of problem solving and how incredible it can be when the conclusions are obvious in hindsight. Who said clarity had to be a serious affair anyway? Make it funny, make it light. Clarity can be fun!