Those are honest questions. You have answers? Do they go beyond your own personal, anecdotal experience?
Here's an alternative way to read my posts (which you don't quote in their entirety):
It's hard to generalize and say what workers' skills really are. Mostly, these exercises are distractions ... since the real issue is about the fair distribution of profits. So, do you think the fast food industry checks out in terms of fair distribution? Why? Why not?
But, for fun's sake, let's try to generalize the skill base that accumulates in a society engaged in heavily capitalized, factory-based labor. Is this a method for "coaching up" the skills of everybody concerned? If not everybody, then what percentage of the people involved in this kind of aggregate acquire skills that are applicable outside the factory? What about inside a different factory? Difficult questions, but history shows that the system survives because the majority of people work in positions where they remain replaceable... and it also suggests that this system needs organized workers and regulations in order to check its parasitic tendencies. There's plenty of "coaching down."
I'd say that people are given a highly specific skill (even if that skill is, at worst, mostly just a willingness to work in highly repetitive and thankless roles). If they can find a way to organize, and use these skills as leverage for better pay, then I applaud them. I'm certainly not going to judge the legitimacy of their organization/claims while either aggrandizing or ****ting on their skills -- especially while their bosses are making killer profits and they're in poverty. I prefer a simpler approach. I'm mostly just happy that people are organizing around labor rather than around empty ideological buzz statements.
(BTW, I also liked your total hipshot assumption that I have no personal exposure to factory-based labor. How did you come by that assumption?)