I went searching for a citation and discovered that you are indeed correct. Wow! Something my High School coach taught me 30 years ago is wrong! Who would've thought it!

What I did find, though, is that there is still a reason for differentiating between low weight, high rep and high weight, low rep. The reason is endurance. LW/HR builds it, while HW/LR does not.

Guess that's why I didn't feel too bad after moving 60 50-pound bags of dry concrete multiple times while putting up a fence a couple of weeks ago.