Politely disagree. M-disc for BD-Rs are still absolutely worth the money if you want to properly archive something. NIST has agreed that the archival lifetime of a M-Disc BD-R is 100+ years.

You have to be careful with normal BD-Rs because there are two different types of recording material on the market: High to Low and Low to High (LTH). You want to stay away from BD-R LTH discs as their longevity isn’t as good as the High to Low discs.

There is a ton of HD-DVD disc rot today. For a format, it definitely did not hold up to age.

Thank your deity that M-Disc exists.

For “major brands” at any grocery store, Reach Pop floss is PFAS free with vegan wax. I like the feel of it and it works well. Definitely not as smooth as something like Glide, but you aren’t getting the forever chemicals either.