If you can master it in a week it isn't a skill. You are redefining the word to make it so broad it is useless to make some ideological point. Also given what I see with Amazon boxes I doubt they can in fact pack better than I can.
Jesus who are you trying to impress talking like that? Putting shit in a box is not skilled labor in the sense being a plumber or an accountant is. Just because I can't define the line exactly does not mean there is no line and pointing out that my reasoning isn't perfect doesn't make your reasoning correct.
It is unskilled labor because words are defined by consensus.
The line is imaginary, and division by any line is not particularly natural or useful.
What consensus are you imagining? I cannot recall being asked to offer an opinion for any consensus.
Who participated in constructing the consensus? What processes are generally available to challenge the entrenched consensus, or to direct the development of a new consensus?
Which groups have supported such a consensus more strongly than others?
When one has spent half a day learning to pack boxes, then a week learning to do it quick enough, I'll grant they have acquired a skill. Probably not a transferable skill, but definitely a skill
There is definitely such a thing as jobs that take lots of book learning and tests to get, and jobs anyone can get by applying for them. This semantic fight of "No such thing as unskilled labor" is just going to make people call it something new and politically correct, but it won't change reality.
It's not semantics, it's just refusing to use an inaccurate name. Just because anyone can get a job doesn't mean anyone can excel at it. Why are you suggesting we should all consent to the lie that unskilled labor exists?
Which is why everyone is an engineer these days. Guy with a mop? Sanitation engineer. Guy who sells stuff all day? Sales engineer. Help desk? No, systems engineer.