When calling out a speed, ie. V1 something usually happens ( pf hands come off the thrust in case of engine out you are commited to the take off) Vr ( you rotate) in the operation I was part of only time V2 was mentioned was if there was an engine failure and the PF calls were engine failure, speed, bug V2 (again something happening) if I was to fly v2 on take off it would give me a deck angle of about 28 degrees depending and a rate of climb ( well I am not going to make you all drool ) but you get the idea.. So yes in some instances a totally useless call in abnormal situations a very important one
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