I think cheating (deliberate/strategic cheating, not simple crap form) works "better" for vertical back work compared to row variations.
Cheating on pulldowns/chins where you use body english to get through the positive and still control a slow negative is relatively safer than using using some swing to bang out more reps on rows. To "cheat" with rows, I'd go with partial reps instead of loosening form to get more full ROM reps.
The only exceptions, I'd say, would be rows where low back stress is already removed or reduced. For example, most Hammer Strength machines. One of my favorite back exercises are 1-arm Hammer Strength DY rows, using "loose form" on the positive, squeezing for a quick second, and then a pretty slow negative.