I used a San Marco dip and dunk back in the seventies, still have nightmares about it! There you are in the dark and the rack gets a bit of sway and those 36 exp films start to swing..eek.
Also lost more that a few 110's when the rack did a less than gentle touch down. I'm sure that I just had a bad machine and dip and dunk is still the best way to process film.