The answer was of course quite easy: Word is a program specially designed to manipulate text. Excel is a program designed to manipulate numbers.
I suggested to him that he might like to type three 5-line paragraph in Word, and then insert bullet points.
Then I asked him to repeat the performance in Excel. He was unable to do so.
I further asked him to perform three or four more Word operations and then repeat the same thing in Excel. Again he was unable to easily do so.
My friend soon agreed with me that I was right.,
Incidentally, bullet points can be inserted into an Excel cell. Visit this link to learn the procedure: https://youtu.be/UytAzptn63E