Since i got my balls in a tangle, i thoroughly check them and now they dont seem to tangle. To be hnest i would not do without them as they are so good at turning in full half or neutral trim, used with the brakes, or without. I think that people ( or students ) should be taught where to hang them when getting ready for take off. Not do away with them, they realy are worth having.
Just got to look after your balls before take off.