The scenario it would prevent is that a government gets a filled in form with someone requesting unemployment benefits, or reimbursement for a medical procedure on account X ... and then government finds out after payment, later, in court, that the owner of the phone never agreed to it and it needs to pay it out again (because the claim, true or not, that a scammer initiated the payment agreement in some way rather than the owner). Same for business and agreeing to a loan and ...
It is NOT to protect you, the owner of the phone, against scammers (it does not really do that at all), it is to protect companies and especially governments AGAINST the owner of the phone. It is a way to fire most EU government employees by allowing automation that currently can't work because you can't legally trust phone and internet automation to be binding in court.