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I agree, the research says nothing about long term effects. The scientific approach is to not judge anything until it's
actually tested. A surprising result is usually welcomed in fact, as this means there is more to learn.
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I've yet to see any research that would confirm it.
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I would argue that there is signifcant evidence for this theory - the c't article definitively pointed to increased angular error,
beyond spec, of the discs with applied labels. This was the cause of the read errors, in fact.
However, I think I understand your line of thought. I agree that the DVD material is stronger than paper, but
any applied force affects it's bending. In this case you have an imbalance of forces; the label side is being pulled
inswards, no matter how slightly, but enough to cause the added 1 degree of angular error. It's not a matter
of the paper label breaking; it's a matter of added tension. Think of the paper more like a rubber band adding tension.
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I've seen these in use by rental operations, and it still tends to shorten the lifespan of the media.
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I found an inkjet printable DVD with sticky label on a commercial DVD (short run) at my local library. It was in
circulation for 5 years, and I was able to read it with no errors. Hardly a generalization, but at least it's possible
for a sticky label to last for 5 years.
I feel hopeful from this fact, but I can't scientifically say I reject or accept long-term use of sticky labels. Do you have any references to further support your opinions? How much does probability affect a recommendation? Certainly it seems possible that one could find ruined discs as well as good ones, but if it's quite unlikely one way, is that reason to totally avoid it? I don't think we really know the answer anyhow.
As much as I'd like to make a nice looking product for a customer, I would unfortunately have to use only LightScribe DVD-DL's as the next best option for now, in the case of long-term, home memories preserving, DVD transfers. Of course I could give them both and if one dies they still have the other
There is also the idea of putting the video 'on the cloud' for the younger generation who would most likely watch their childhood-selves on (private) YouTube. (Is there private YouTube? I've never uploaded to it.)
My main interest is in providing the client with a professional looking product. At worst they could come back to me 5 years later and say 'my disc is skipping 2 hours of the way through'. I don't know how important that tid-bit of video is to them. I could use the suggested techniques to copy and re-burn their video. Actually it's unlikely they'd come back to me at all. Of course I don't want them to be disappointed at all.