Hi Vilas,
As you know the Summary is a tool to manage the workload during a complex failure when time is critical.
The Summaries contain the minimum information to get the aircraft on the ground safely. In fact some procedures embedded in the Summary have been greatly reduced of information given the context of an already high workload vs time-criticality.
A ‘blanket’ recommendation to use manual thrust when in Direct Law does not fit in the philosophy of a Summary, after all it is not prohibited: hence safe enough and not worthy of mention in the Summary.
If remembered and applied by the crew as a technique, it’s a bonus.
Sorry, just read you were talking about the STS page. Same applies there to a certain extent, STS does not mention recommendations.
G+B is a special case due handling degradation in addition to the obvious F/CTL law degradation.