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It's common for manufacturers to recommend that certain parts be replaced regularly based on round count. The manufacturer will generally provide recommended round count replacement intervals for various parts such as recoil springs or other normal wear parts if consulted, or in the owners manual.
The reason you fix it before it's broken is so that it doesn't break or malfunction when you need it, and/or so that the worn out part doesn't cause damage to other parts because it's not properly doing its job.
As far as the potential for installing a defective part--that's always a possibility. A gun should be tested thoroughly after any modification or parts replacement. That should go without saying.
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