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Some disappear to be replaced by other jobs, some become automated. We no longer have lamplighters but we have callcenters.
But of course most "low skilled" jobs are necessary for society, cleaning, delivering, driving a bus, some care work (most requires several diplomas) and it won't work if everyone goes to "high skilled" jobs.
And as everywhere else, now and throughout history, immigrants often take those jobs and often get no thanks. It'll be interesting to see the effects on social attitudes towards work and immigration now that immigration for some roles is more limited.
But you cannot outreason fabricated feelings of fear and economic competition for housing / any job will do I must work won't end under UK capitalism soon so...
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Hard not to equate 'low skilled' with 'language skills' in my estimation that's one of the biggest reason low skills and immigration are linked.
To the point where people wonder why you would do a job that doesn't require you to speak English when just answering a phone is seen as better pay and conditions.
Also prevalent in the building industry where the builder with the best language skills will be worth more money on a team because they can communicate with clients directly.
What baffles me about high wage, high skill economy stuff is what happens to all of the low paid, low skilled jobs?