Some jobs are necessary but most can probably be replaced as automation goes on. I personally think its a necessary evil right now otherwise who would be fixing some of the most nasty issues such as cleaning out issues in the sewage system. Over time though as we get machines to replace it then the jobs can go away.
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Yes I'm not saying all jobs will be removed now but with time it will and on a reality like that many of us can't rely on the idea we will work till a pensionable age
We will need to find other ways or storing value and making money that won't involve the skills we acquired initially
But this jobs is the heart of the economy is nonsense