To mark the difference plainly: we do not use a power of attorney in that form here. Representation is either direct or indirect, and where it is indirect the representative becomes jointly liable for the customs debt.
That liability is precisely why the verification is not optional. A representative who accepts an appointment without establishing who the principal actually is has taken on a debt on behalf of a party they cannot identify.
Your standard does not read as strict to me. It reads as someone who has understood what they are signing. And the difficulty you describe, an inexperienced importer who cannot see why any of it matters, is the same on both sides of the Atlantic.
