I think the idea behind is that they're used as a secondary tool to improve the main lifts, where the lats work as stabilizers. And working as stabilizers, it's useful to train them with a high number of reps - that's the logic I've read around about Kroc Rows. I know he came up with those after he consistently missed the lockout with his heavier deads.
I think they're good as mass builders too, but I don't think they're the best option for pure strength - Pendlay shoud take the cake, there.
Not sure what's the point in that, tho.
If you do a dumbbell row, you call it a dumbbell row.
Once you start dumbbell rowing with more scapular activation, more rom and for very high reps, you call them Kroc Rows.
It's just more practical for sake of argument imo, don't understand why how much weight you use is important. Kroc could rep 200-300lbs, fine, but if you do the same thing with a weight scaled to your strength level, what's the matter?
Well, again from what I've read around... Kroc is Kroc. He is (was) a pro powerlifter of elite level, so he perfectly knew what he could dare and what not.
The argument against straps on Kroc Rows is that grip is like a fail-safe, as long as your natural grip holds, you can row. With straps, your grip is artificially enhanced - which could cause biceps tears or ruptures with that movement.
I don't have straps so I've never really pondered on the subject but it makes sense to me to avoid straps if possible and use them only if you really know how far you can go.
It's like, just because Konstantinovs deadlifts with a rounded back, doesn't mean everyone can afford to do it.