No, they shouldn't know how. Most of what there is to know about fixing a coffee machine is useless tedious bullshit. No one's life is enriched by knowing which

No, they shouldn't know how. Most of what there is to know about fixing a coffee machine is useless tedious bullshit. No one's life is enriched by knowing which error messages mean what, and which are misleading, or where the part replacement catalogue is stored.