Along with what's been said - I like the confidence I get knowing exactly where I'm hitting on paper. It gives me more confidence to take that little bit longer shot.
Who knows, your body might have changed and you hold the gun slightly different and your eye might not line up exactly as it did a year ago. The paralax (IIRC/SP) factor with the cross hairs can put you way off.
Lastly, shooting is FUN!
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