Sigh. I can't tell if people are being sarcastic or not, so...
``In a nutshell'' means summed up concisely, so that the summary can fit ``in a nutshell''. Nutshells are typically small, leaving little room for anything.
i am not surprised in the least. Sarcasm is a particular form of humor. Humor, according to researchers, requires significant IQ for creation and appreciation.
So, Ben, you don't get the joke. So......