I don't disagree regarding the phone cradle but a simple extender resolved that problem for me as I usually want to view my phone's display anyway.
Amazon.com: Lightning Extension Cable (2 foot Black) for iPhone 6S, 6, Plus and 5/5S/5C; Pass Video, Data, Audio Through Male to Female 8-pin Cable. dockXtender for Lightning by CableJive.: Computers Accessories
The mount I chose was nothing special but looks decent even when not in use:
Amazon.com: Car Mount, Archeer Dashboard Magnetic Smartphone Holder 360 Degree Rotatable Cradle Mount Kit for iPhone 6s 6 Plus, Samsung Galaxy S6 Edge+ Note 5 S5 S4 and Other Android Devices: Cell Phones Accessories
Getting an extension cable is easy enough, but what would be nice would be an actual cradle that could be attached to the inside of the lid so the phone could be dropped into it once plugged in. What would work best would be something designed to be attached using the same two screws that Tesla uses, and that replaces the cable and the connector that are currently in place. If the bottom of the compartment is lifted off, it would be easy enough to unscrew Tesla's part. Likewise, it would be easy for Tesla to replace that piece of junk with something that attaches in the same place. For what they charge, it would be easy enough for them to come up with a cradle and make it work with whatever cable a person wants to use, including a solution for anybody with more than one type of phone in the family.
Tesla showed off a nice cradle for the X. I haven't seen it in person, but why can't they come up with something for the S now that they claim to have designed a decent phone cradle?