Once again...Basic Airmanship...
Forget the new gen stuff, but the "real" Captain will know when the A/C is ready to fly...or not...
Weight is wrong??? No prob...abort or give it a few more seconds...
Data received from the gate or Ops COULD be wrong...A crew should get their first clue when the breakaway (From the Gate or Ramp) is more or less than normal...Thus the results will follow...