There is no time to assimilate information whist on the takeoff roll so they make the decision rule-based.Its cut and dry.Below V1 you reject,at or above,you go.Its one of the few scenarios in aviation that is like this.Why do you think that poor Concorde pilot took his crippled aircraft to the skies?
As for ever taking a fire into the air below V1,well if you realized at high speed that the perf calculations were for another runway then you might push the thrust levers forward and elect to go at V1-10.The old eyeball method will tell you what is best.