I re-read your posts on this subject, as supplemented by Norma's last post. Like you, I have tended to consider a dough to have overfermented when it has gone off the edge of a cliff, or is hanging by a gluten thread at the edge of the cliff. By that time, the protease enzymes have concluded their work and the dough can be wet and slack and hard to open up. I have intentionally driven some experimental doughs off the edge of the cliff just to see what the dough looked and behaved like. My experience was as you described in terms of the dough's performance except that I found that the residual sugars were too low to produce good crust coloration. I don't know if it was because the yeast had consumed most of the sugars, or if the acids and pH levels interfered with sugar extraction, but the finished crusts were light, almost white in some cases.
In retrospect, in the case of the short-time doughs that we have been discussing in this thread, I might have used the term "excessive fermentation" instead of overfermentation, but that may be a distinction without a difference. When I read what Tom Lehmann wrote on emergency doughs, I intentionally looked to see if he used the term "overfermented", or anything comparable, for the short-time doughs once they started to age. He did not. I think it is possible that he was thinking more along the terms of usability. That is, if the emergency dough were allowed to ferment too long, it would not be practical to use it as intended because of a damaged or degraded gluten matrix structure. In a home setting, rekneading or reballing the dough and letting it rest to recover might work, but that would take time and not be practical in an emergency dough situation where time is of the essence. So as not to waste an emergency dough that was not usable in the short term, Tom suggested using the dough to make skins that could be put in the cooler for use later in the day. That action would suggest that Tom did not deem the dough to be about to sustain a near-death experience where last rites would be administered.