I disagree. I don't think it's a stretch at all to think that if kilnforming can cause changes in the glass composition that flameworking can as well. Flameworkers can have the glass going through many heating and cooling cycles for 30 minutes, an hour, longer even, and they are getting it hotter than the kiln range given. And the bullseye link doesn't use "and", it uses "or", telling me that they say any of those things can cause a change significant enough to impact stability in a piece.
Again, I'm not saying I'm agreeing with the cool working=no cracking thing, since I haven't had cracking problems and I don't work cool. I'm just saying that even bullseye lays a logical foundation for the possibility.
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