Except that I'll bet you didn't use Taiyo Yuden or equivalent quality discs. I have, first one batch of Kodak Golds 15 years ago, then Taiyo Yuden, and haven't yet suffered a data loss yet.
Although now that my data has gotten large enough I'm using LTO tape backup.
Good quality discs, in tyvek sleeves, with no writing on the discs, stored in temperature and humidity and light controled environment: it's not trivial for people to achieve.
ADDED: I see you aren't who started this sub-sub-thread.
But I'd add that except for the environmental control, you don't have to go to great extremes, CD-Rs are physically rather robust. But you did/do have to do your research, to discover that you need to buy Taiyo Yuden or MAM-A media, and get discs from a reputable source (there was a lot of TY counterfeiting some time ago), and store them properly.
Although now that my data has gotten large enough I'm using LTO tape backup.