I just found this interesting article. If you are interested, it is a review of the following "conversation of articles" (which are reachable from the OP but I guess it's useful enough to list):

  - https://www.maa.org/external_archive/devlin/devlin_09_07.html
  - https://www.maa.org/external_archive/devlin/devlin_06_08.html
  - https://denisegaskins.com/2008/07/01/if-it-aint-repeated-addition/
  - (the link I posted that creates this thread)