Several things at work, here ..
(a) the aircraft is moving (ex lineup) which is a plus (some speed versus stationary)
(b) the presumption is that thrust is set without undue delay .. as in, typically, spin up, a quick check of the gauges, TOGA. Now, I haven't flown the NGs but I presume that they aren't too different from the classics where the whole lot can be done in the last bit of the alignment with the runway direction - ie, by the time the aircraft is pointing in the right direction, thrust is coming up to the takeoff setting. Folk should keep in mind that there is nothing wrong (on normal width runways) with starting the roll off centreline and coming back in the first few hundred metres.
(c) where there may be a concern is on a short runway (or intersection departure) at light weights where the aircraft can roll a reasonable distance at low thrust. In such cases it is important not to play about too much .. the aim is to get the aircraft rolling in the right direction with thrust set as soon as is reasonably practicable.