If something is better, healthier, more natural and less painful for the horse, why not use that? I'd go out and actually say that users of a harsh bit to gain control of their horses are selfish and don't care about the horse. Not being rude, just honest. I've ridden my entire life and my horses know what I want from them when I want it, without a bit, because I work with them.
People who don't ride their horse for a month and them jump on and yank around on the bit really just anger me. WORK with your animal and do what is best for the horse. If you can't ride without a bit, outside of the pasture, then you are not a horseman and you should work on groundwork, feel and confidence.
Anyway, I'm off my soapbox now.
But really, when would a bit be absolutely necessary (besides competition where it is required)??
Why do you use a bit? What kind of bit do you use? What real benifits does a bit bring to a horse (not the rider)??
I'm really just genuinely curious of some of the other opinions out there.