Following on from Dick's comments, a related concern is those pilots who try to factor reduced weight as somehow permitting the use of a higher g-loading. While there may be some justification from a wing strength consideration, one ought to keep in mind that the various bits and pieces bolted to the aircraft are designed for a fixed loading ....
So consideration of reducing Va is not a just a matter for ATPL exams .. it still is well in the engineering design and certification arena concerns ....