A set trigger is made for offhand shooting. Nobody can hold the sights still shooting offhand. So, what you do is time the sights as they pass over the target, and pull the trigger. Yes, I said pull, and not squeeze. You only have a nano second the pull the trigger as the sights pass over the target. They are moving, and if you squeeze the trigger you'll be past the target when it fires. Squeezing the trigger is for shooting from a rest when you can hold the sights on the target for long periods of time.
I only shoot offhand, and use a figure 8 pattern with the sights. A set trigger is light with zero creep. It just takes a light touch to fire. Timing the moving sights with the trigger pull has to be fast. The set trigger is perfect for doing it.
Anybody who doesn't like a set trigger probably shoots from a rest.