Agree. I've been researching data retention for many years and, except for Rosetta projects, there are no better user-friendly ways than using M-Discs for storing digital data. But there's a "but". You need a reader. If you don't, you need a microscope and deep knowledge of how data is stored on all OSI levels. From laser frequency to JPEG compression algorithms. In this case Rosetta analog microprinting wins.
When picking the archival medium, you have to also optimize for how people will read it in the future, yes.
No point in having a disc survive 300 years if no one has working blu-ray readers at that point. You would have been better off with microscopic text etched into metal, or plain old paper. Or maybe some variation in between like metal sheets with stamped out QR-codes that do light compression reversible by humans manually into english and numbers.
