Golden rivette
The reference for Direct Law is given by OP DES. The problem is aircraft just doesn't transit by itself to Direct Law but it's the result of other multiple failures. There is no point giving the information in Direct Law which no one reads. The STATUS of the failure should ask you to switch off the ATHR. Unless it's a personal choice as is in the case of OEI. The reason for recommendation of manual thrust is understandable. In Direct Law the aircraft switches from flight path stable to conventional speed stability. So it's liable to pitch up with thrust changes like B 737, A310, A300 so if AP off, then ATHR OFF.