I worked cellular retail for 8 years I’ve never really seen fried pins on iPhones. The frayed cables are pretty much inevitable especially if it is apples first party cables. Shockingly I have had contamination in usbc ports though. It caused several devices of mine to no longer charge due to corrosion. Still not sure what exactly caused it but I suppose it was juice from a vape that leaked into the connector. Basically fried my laptop c ports, my iPads port and my pixel’s port. I still think the move to c was pretty necessary.
Only complaint is cables that have contaminants can easily travel between devices now.
Other than that the protocol support is all over the place.