For example having 3x the pins is a big plus. I don't know why you are so focused on not including the protocols a port can use. Apple will most likely use USB to make connections between PCs and their Phones possible. And you have to have connectors capable of carrying the signals for those protocols.

The huge speeds of USB 3.0 (USB 3.2 Gen 1x1) and up are because of added twisted pairs carrying the signals in duplex (Plus a new USB A connector). Anything above USB 3.2 (USB 3.2 Gen 1x2 and USB 3.2 Gen 3 2x2) needs to use USB-C because the older USB-A Connector doesn't have enough pins to allow a connection to a cable with 4 twisted pairs (plus one for backwards compatibility).

I think the lighting connector is enough to allow for a USB 3.0 connection, but you would have to switch the signals after it comes out of the port somehow, as the 3rd pair is not used during FullSpeed (I think there's an adapter that does this)

Even if they don't use USB and develope their own protocol, it's gonna benefit from more parralel connections