Micro was weak and largely people’s first experience with frequent-use plugging. Cheap cables don’t last long. Car use is abusive, even using the phone while charging is harsh. Moving the phone by the wire. Hard cable angles to keep the phone upright in stands, cup holders, cups, whatever. Rolling the cable tight for storage or travel. Pulling by the cable to unplug instead of by the head. Accidentally tripping on cables or otherwise yanking them. It’s death by 1,000 papercuts for the cable. Shit happens.