Because some jobs have an average turnover <6 months, so it makes sense to optimise those first months.
Apart from low skill jobs, there's also seasonal work. For example fruit picking and packing. There's only 1 or 2 months a year that they're operational, so it makes sense to optimise those systems for inexperienced users.
Sure, there will be some who work every year for decades, but there will also be a lot of seasonal workers who only ever work one or two seasons.
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Because some jobs have an average turnover <6 months, so it makes sense to optimise those first months.
Apart from low skill jobs, there's also seasonal work. For example fruit picking and packing. There's only 1 or 2 months a year that they're operational, so it makes sense to optimise those systems for inexperienced users.
Sure, there will be some who work every year for decades, but there will also be a lot of seasonal workers who only ever work one or two seasons.