Confirming our suspicions, the Lightning connector/headphone jack/microphone ribbon cable is indeed soldered to the logic board.

This is just another example of how Apple is simplifying and grouping the components in its products. Unfortunately, in doing so, it's inadvertently putting an end to repairability.

We can't suss out the reason behind the shape of this ribbon cable. Perhaps Apple put it there for sh*ts and wiggles?

The backside of the logic board.