If an exercise works for you then do it, who cares what other "Hardcore" meatheads think. If i could not do BB rows cause of injury i would do what ever i could to work my back. Seated cable rows are a good exercise if you can´t do a free weight row, close grip and wide grip. Build muscle too, infact one Gym i worked in i remember a Kick Boxing Trainer who did just seated cable rows and wide grip chins. His back was very good.