not often.. but it does happen.
I was reading your linked article and got to the second topic - 21 Personnel. I was a sentence into it and said to myself, "I never see this, I can't recall a single play like this". The paragraph continued by saying how it was used... by whom, the strengths of this personnel grouping, etc, and all the while I'm thinking - "I'm missing something here, I never see this"... AND THEN...
The 21 Personnel group topic ended by saying "The Rams never ran it in 2018, not a single play".... and I felt like a genius.
I'm not a genius, of course, although I'm sure many of you would beg to differ. Doesn't stop me from occasionally patting myself on the back, however. - JamesJM