> With the two examples you chose, I‘d say there is not much of a skill gap.

Unless we're talking about really high end burgers, you can take almost anyone off the street and train them to flip burger patties within a day. They might not willingly do it on account of it being boring/tiring/poorly paid work, but it's not exactly hard to learn either. I doubt you can do the same for an accountant, unless your idea of an accountant is something like "manually copying entries into a ledger". Even teaching excel to someone who hasn't used excel ever, to a capacity where they can do meaningful financial reporting probably can't be done within a day.