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> They don’t “need to know” for reasons which are of significant practical benefit to citizens/residents.

Staying for more than six months is usually one of the main measures to determine if one is resident and should pay taxes in the country, so there is at least a very good reason (although I don't know how much this applies to the USA specifically).

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Anyone who earns income working in the USA has to pay US income and payroll taxes.

you pay income tax in the country you live, not where you work (i.e. if you were employed by a US company, but working remotely in the UK, you'd pay income tax in the UK)

Any country can try to extract any tax from anyone it likes, and in general the US does.

Except if you are working for a company that is sending you to the US (your company makes the income). It's easy to argue for 2-3 weeks, harder to argue for over 2 months.

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