This has nothing to do with magic, it's just physics and chemistry.
It's no different with electronics, there's a huge industry that supplies pre-aged electronic components (only a small portion of them are capacitors), including for measurement technology, avionics, automotive, medical technology, etc. It's expensive and the manufacturers don't pay for such components for fun .
A few examples from IT.
15-20 years ago I started overclocking CPUs. Although initially unstable at low overclocking, these CPUs ran absolutely stable after a 48-72 hour burn at 50-100% overclocking (assuming appropriate cooling).
In the '80s I did my training with a professor who also owned a computer company and sold computers to universities. His computers, which at the time were all assembled from individual parts, had the reputation of being the most reliable. The secret: he ran each computer for a week at 20% overclock with a stress test.
Even a new high-performance server should first be allowed to burn under full load for 48-72 hours before installing an operating system. I didn't do it once because we had an outage. Man, that was a stupid idea...