When you alter loft on wedges, it has an effect on bounce.
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Depending on how you impact the ground, this alteration could negatively or positively affect your short game. Wedges with more bounce are designed for those who catch it heavy and play on soft turf, while less bounce is geared for firm turf and those who can feel the head bounce off the ground at impact.
It’s because of this that you should never alter loft more than two degrees in either direction.