You are lucky... And/or just don't have a large sample size. Of the multiple hundred CDs I've burned back in the day, some failed in just a few months. Admittedly, it was in tropical (high-humidity, high-temperature) settings.
As for HDDs, I lost about a quarter to a half, with the rest just being obsolete these days. I can definitely attest from personal experience that hard disks from the same series tend to fail at the same point (I had 3 WD blue HDDs in a single computer, as system, data, archival disks; the system one failed, so I moved the system to the data one, which failed a bit after; so I retired the third one; failures happened at about the same runtime according to SMART data).
As for HDDs, I lost about a quarter to a half, with the rest just being obsolete these days. I can definitely attest from personal experience that hard disks from the same series tend to fail at the same point (I had 3 WD blue HDDs in a single computer, as system, data, archival disks; the system one failed, so I moved the system to the data one, which failed a bit after; so I retired the third one; failures happened at about the same runtime according to SMART data).