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Way back when I used to copy movies to .avi files, my computer was in one room, my TV in another, I had a video card with TV out and a long set of cables, I’d preserve the copyright warning because it gave me time to start the movie then walk to the living room to watch it…
DVD is better than Blu-ray in that regard - I’ve ripped DVDs that look like they fell off a truck and got run over multiple times and had no problem, meanwhile about 1 out of 5 Blu-rays I got from Netflix would have problems despite looking pristine. It has to do with the data density, Blu-ray packs so much more in the same amount of space, one microscopic scratch wipes out so much data…
Of course some DVDs suffer from bad materials. I was re-ripping my collection recently, and I have a few that have sat in a closet untouched for years, not a scratch on them, but the drive won’t even recognize there’s a disc. Probably oxidation of the reflective layer.