As a machinist, the experts I've consulted regarding springs of any type all concurred that a quality spring only wears when it goes through many compression and relaxation cycles. A spring under constant compression should not lose it's force.
The pressure on the mag "Lips" is another story. The greater pressure of a full load on the spring creates great force, enough to bend sheet metal over time. That's the reason I don't keep mags loaded for storage.
YMMV (Your Mileage May Vary)
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