i agree with Rubic
reviewing the Take-Off brfg on the roll, can and does lead to a loss of situational awareness.
After a complete brfg has been carried out at the gate before pushback,it makes sense only to review any changes.
a lot of the stuff on this so called final take ff brfg some airline SOPs require, are part of the before take off cheklist(on the buses atleast)
Other stuff like fuel state, a/c wt etc need to be moniterd on a continuos basis in all flt phases,which forms part of enhanced situational awareness.
SOPs cant replace true airmanship