Same as using a USB drive my guess..
flashing would be no different then reading and writing pictures to your device.
IT wont get bad sectors cause it is not magnetic media, in this case its wear corruption but modern flash tech is pretty good where they tried to destroy a USB stick by writing 16,000,000 cycles to the same spot and it was still intact.
Aka dont worry about it, only thing flashing causes is anxiety to the user
