The bells... the bells...
SBC pretty much covered it, but another important point about the bell is that it produces a sound that isn't limited to a particular direction. Electric horns, air horns and devices of that nature produce loud sounds in a specific/limited direction. The ring of a bell not only carries well, it carries in every direction.
Regarding the number and types of spotters, the intent is that you have a spotter for each rider and that the spotter is capable of rendering aid to the rider(s). If, God forbid, your 250-pound skier is rendered unconcious during a fall, you're going to want more than a 90 pound 13-year-old trying to get him/her back in the boat. Luckily those circumstances are rare, but the thinking behind the rules make pretty good sense -- safety of the rider.
This topic reminds of the night I saw a single driver (no observer) towing a father and daughter on a tube toward the broads -- a harmless situation that could so quickly turn ugly. Now if we can just get some summer weather back!
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