...go back and read the blog (I posted a link in one of these threads you were involved in) about the recrafting of a pair of EG...at EG. There the shoe...not just the insole...had been used as it was intended and all "the other components" (which, with the exception of the outsole, don't do anything to hold it together) were indeed in place "as intended by the manufacturer." And yet the GY inseaming/gemming had failed to the extent that EG determined it needed to be completely rewelted.
I haven't read the thread referred to in bold above. Just taking an initial guess, is it the EG recrafting series of posts on Permanent Style? Starting here with part 1 - How Great Things Age Edward Green.
If you compare the 5th and 6th photos carefully, it seems to me that the canvas ribbing is damaged during the process of chiselling out the cork filler. I'd expect EG to take greater care not to damage the shoe like this during the recrafting process, especially given the cost.
Onto the main reason why I replied to your post - specifically the last sentence quoted above. Does it matter a great deal whether a GY shoe is rewelted, other than the obvious additional cost? I'm not sure I'd like the look of an old welt next to a new outsole, therefore I was planning to ask John Lobb specifically to rewelt my next pair, even if it's not necessary. I've worn the sole down close to the welt at the toe and it's looking a little ragged to be honest. Perhaps I'm missing something that an expert would know.