You have to understand that airline pilots are taught that all planes fly after V1, like there is some electromagnetic cushion provided by the airspeed indicator that defies all logic and physical reality.
That way, when the pilots rotate after V1, they are completely impervious to the fuel truck stuck in their landing gear, the birds that went into the engines, the 02 canisters exploding in the nose, the terrorist that took out the flight controls, the jack screw that wasn't properly inspected, the ice they didn't clean off, the 152 that slammed into the cockpit, the cargo door that just opened, the copilots who's seat that just went full rear(but he's still flying -lol), the FOD that takes out your left engine, the deflating or blown tires...on and on...
You see, that way, you can use less power on the roll, less power = longer overhaul times, the company saves money. They are happy, you have a job, your happy.
See how this works?
So the next time you when you push the throttles up only part way, and burn up all the runway to VR, don't think about this stuff. I will only make your head hurt, and you won't be considered a team player.