re speed control
hi mxwbuaa
Having operated in jurisdictions using both documents, they are trying to say to "use speed control to the minimum amount necessary".
If you can use only one or two speed control adjustments to achieve the spacing and flow required is much better for the aircraft and crew than using many speed control adjustments, which increases the workload in the cockpit and will have the aircraft well outside its profile.
Also one should avoid increase then decrease in speeds as well for same reason as above.
cheers