Comment by chuckadams

Lightning’s form factor is nice, but there are still a few issues with it. Look at any Lightning cable you’ve used for a few years and you’ll probably notice one of the contacts is darker than the others. That’s from arcing every time you plug it in, and that just cannot be a good thing.

The springs being on the socket is also not a great feature of Lightning, though usually the device itself has a shorter lifetime than the socket.