I can trigger an S&W revolver dozens of time without ever cocking the hammer, just turning the cylinder. That is a trick, of course, but anyone who can do it has superb trigger control.
But normally, you want full reset and it should be positive and firm. Loss of that reset is an often overlooked problem with amateur "trigger jobs". failure to reset can allow hammer follow down or even in rare cases, full auto fire.
Like other areas of trigger control, a lot depends on what you use the gun for. A range queen with slow or unreliable reset may not matter much; such an SD gun could get you killed.
Jim
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