Long before #USBC was pushing out 3½mm #headphoneJacks, #HTC had already tried the same with for instance their #TyTNII aka Kaiser. (Whose form factor with slide-out keyboard and tiltable screen I still kinda miss...)
Today I came across my 3-in-1 USB adapter I got for it at the time: #MiniUSB plug on one end, and on the other end ports for a 3½mm headphone, mini-USB for power/transfer, and HTC's own headphone jack.