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I have a different experience with lightning. Almost all my lightning cables show burn marks on the connector on one side and charge only in a particular orientation. This behavior reproduces with new cables and new iDevices. Anecdotally, I never had any issues with USB-C charging.
> This behavior reproduces with new cables and new iDevices. Considering that this is almost certainly related to your own personal behavior and/or environment, it isn't surprising that you find it reproducible, albeit a bit odd. It only charging one way indicates corrosion, probably on the cable itself, but possibly on the female port on the device itself. Burn marks probably means there's a grounding issue somewher…
Hey, before you accuse people of doing the wrong thing, make sure you're right. Lighting has historically had shorts issues when inserting, and Apple has tried their best to resolve the problem. They never 100% resolved the problem however, although it is far less problematic with newer plugs. It's a big part of the reason why Apple went all in with USB-C so quickly after introducing Lighting.