I used to be concerned about optical media longevity. I bought Taiyo-Yuden discs. I checked their integrity. I stored them carefully. But the format became obsolete (for me) long before the media degraded. Recordable discs are just too small for the backup use case I had. Optical drives are still available of course, but they are now rarely standard with a new PC or laptop, and soon will become specialist components, and then it won’t be long before the drives become a greater limit to longevity than the media.