As someone (without a huge amount of experience) designing some hardware in the space, me too. The two usb controllers was the first thing that made me double-take. Maybe one is only capable of doing back-forth on the external line and one is dedicated to control for the camera/light hardware? My huge takeaway was, "yep, charging 2k for a bunch of last year's good phone hardware means you can stuff A LOT of it in without worrying about your BOM too much".