If, before a maiden flight, you don’t check that control surfaces move in the correct direction, this can quite simply be corrected on most TXs via their servo reverse function and can easily be carried out whilst you’re deciding whether to rebuilding the model, or not.
Did you know that heavy things like RX and flight batteries, which are not secured properly can be used to create stunning aerobatic displays as they move around – best effects are achieved, during flight, when they actually drop out.