I've been towed a few times on ropes, probably towed an equal number of times using one. I was only once towed by the AA with a bar. The latter, was a month old car, where the ECU had died, in lane 3 of the M62, at speed. I was lucky to have enough speed to be able to drift it across to the hard shoulder. I must say, I found the (solid) bar inspired more confidence, as I was dragged off the motorway, but I found I had fewer clues as to whether I needed to be trying to brake, or not, I was so very close to the AA van. The rope at least, you can see it going slack, and have a little more warning.
Not just the elderly....
Towing the caravan, through a busy city centre one evening, the lights changed and I was about to move off. Lucky I glanced in my RV mirror, to spot a youth, attempting the clamber over the A-frame.