It depends.
Springs do weaken and wear out after many thousands of rounds, or even way less on some guns like snubby 1911's and such.
Weak springs eventually result in malfunctions of some kind, again depending on what gun you are talking about.
But way before that, semi-auto guns are beginning to take a beating because the recoil spring & hammer spring are not up to the task they were designed for, which is partially to protect the firearm from excess battering.
I think it is cheap insurance to replace the springs on any older semi-auto's I acquire, just to help prevent excess frame or receiver battering for instance.
Other guns like bolt-action rifles, pump shotguns, and revolvers will go a life-time on the same springs they came with.
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