Hahah....who is this moron?
Just someone who knows more about the sport than you, obviously. You and your little friends go wrong looking how Yates, Ronnie, Jay do it AFTER THEY HAVE BEEN TRAINING 10+ YEARS, NOT MENTIONED THAT TRUCKLOAD OF GEAR WHICH THEY HAVE USE IN THOSE YEARS. If you fill your system with gear, it really doesn't matter how you do your rows, you gain mass anyhow. On the other hand, if you are building your body without any gear, and you wish maintain your ability to do these rows, you listen to wise old geezer. You brats are ego builders without any real understanding how your body works, and you have great hurry to deny the fact, that you get the best benefit by using full range of motion.
You prefer heavy load and half reps, and then you are whining about sore back, lack of mass etc. which all comes because you are using weights you cannot handle. I have seen this thousands of times and I will see it thousands of times again, because you teenagers never learn. You guys are so stubborn that you don't even try to do it right, because it means that you cannot use as much weight as you have been using while yanking those useless half reps, and you are afraid that some one see it and think that you are weak. Funny part of this matter is that by doing it with full range of motion, you gain more power and fast, because that is your backs first response for this exercise.
In my gym there was this young guy doing rows with Yates style, and after each set he was walking around keeping his hand on his lower back and obviously in pain. I point out the faults which he has done and show him a correct way to do it. With Yates style he was lifting 240lb in his best set. With this "old school style" he was soon able to do sets with 320lb and without the back pain. To get there he concentrate for a while to training his lower back/ middle section in shape, because you really cannot use your full power without good support from middle of your body.
I told you that I do 40 reps of hyper extensions three times per week. Twenty years back I read somewhere that Robbie Robinson was able to do 20 sets with 20 reps, so I have to try it, and at the end, that was easy task for me. These days it would be more difficult, but I have done half of it just to try how it goes. Your best effort is what? 1 x 12 reps?