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As above tax is hard to understand and you are only likely to make the effort to understand it if itโs causing you particular stress.
But itโs unlikely heโd be doing office / clerical .Possibly high personal risk work like oil or something that pays by the amount of jobs you do, ie plumbing / gas etc.
Willing to bet a big chunk of junior to mid devs are equally blinded to be fair. You understand what you need to. Fair, they arenโt earning 80k but by measures they will be intelligent.
Oh and value is contextual.
How did a man with such a fundamental lack of understanding regarding tax and statistics get himself a job earning ยฃ80k?