The two stage trigger was developed to reduce unintentional discharges from the rough handling infantry rifles receive on the battlefield. When a rifle is jarred, it can cause the sear to bounce, releasing the hammer or striker as the distance needed to release the sear is very short.
A two stage trigger prevents the sear from being released if it bounces when the rifle is jarred. Other trigger features to prevent sear release when the rifle is jarred is a heavy trigger pull and a long sear engagement. Many military triggers use the two stage trigger design, heavy pull and a long sear engagement. FALs, for example, are notorious for heavy, two stage triggers with lots of creep, breaking around 8-12 lbs.
Another way the two stage provides safety is that the initial stage gives a tactile warning that the trigger is being pressed. It is to give a shooter under stress time to back off the trigger if it's being inadvertently pressed. (This is NOT a substitute for keeping the trigger finger outside the guard.)
Other than National Match Service Rifle, two stage triggers are rarely encountered in competition as most feel the single stage disturbs the rifle less than a two stage. I do not believe this is always the case.
A clean predictable break is far more important to precise shooting than the number of stages the trigger has. A two stage, especially one with a long reset like the Geiselle has, trades speed for an increased margin of safety. Whether or not that increased margin is needed, only the shooter can decide
About "good triggers". A good trigger is one that is reliable and predictable. Reliability means it fires every time and predictable means it performs and feels the same way every time it's pressed. Smooth is what makes a good trigger (reliable & predictable) better. A good trigger is still a good trigger and doesn't always need to be replaced with a better one.
A trigger that's reliable but with an unpredictable pull is merely acceptable. An unreliable trigger is a poor one and should be replaced.
A better trigger will not make one a better shooter, nor is it a crutch. It's just better and makes it easier for novice and expert alike to shoot their rifle well. Easier enough to justify upgrading a good trigger? That call is up to the individual and the only way to know is to shoot


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This trigger is not one that you will "grow" out of and soon find yourselves wanting the more expensive models.
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