[hnbad]

I actually doubt there's a neat defineable ceiling for the skill of a welder nor a barista so it also comes down to where you make the cut-off because any improvements beyond that become negligible in terms of ROI. But that would also require being able to actually quantify that vague notion of "skill" which in turn would require an honest assessment of the actual real-world exhaustive job description of both jobs including all implicit, unstated and culturally expected parts (e.g. barista is a service job so customer service can be as big a factor as the actual coffee-making but we don't think of social skills as actual skills or emotional labor even if it's obvious when they're inadequate or badly performed).

So in other words, we could have an objective, empirical look at whether welders or baristas actually need "more skill" and which skillset is easier to master for the average person (which is its own rest nest of considerations again) but if we did the necessary (if not impossible) prep work to even get started on that, we'd have to already agree that "unskilled" is a descriptor for jobs that has very little to do with the actual skill requirements and more with attitudes towards those skills or the people doing those jobs.