Its only a problem if the delta between adjacent bits grows too large. "Wear-leveling" is a type of auto-defrag that will shuffle data around intentionally to k

Its only a problem if the delta between adjacent bits grows too large. "Wear-leveling" is a type of auto-defrag that will shuffle data around intentionally to keep these deltas equivalent. "Program-erase" cycles (the lifetime of the gate oxide layer that you literally destroy) are an order of magnitude less worrisome, and the larger the drive the less this matters.