I'm surprised this is not more common. I have been doing this since 2016 (started with DVDs and quickly moved to Bluray since writable DVDs are more prone to failure).

Do you periodically re-read the old discs to check them? I burn a par2 recovery set (around 10 percent) onto each disc alongside the data, and once a year run a full verify with dvdisaster or just par2 verify. A disc that starts throwing correctable errors gets re-burned while it can still be read cleanly, which matters more to me than the rated lifetime of any single disc.