To be "fair", the kid on the text phone was presented as being a whiz, the fastest of his peers. The two old guys with olde fashioned eye shades made the text kids look silly. I don't recall if the guy had a straight key, or a Vibroplex. It reminds me of an announcement a few years ago of the world's fastest data transfer rate being held by a canister-full of floppy discs in an Edison-era vacuum message-tube system on Wall street (before computer media chips). The "best" technology is often achieved by revisiting the past and applying it to the present.
Communicating in voice-only may enable faster data transfer, but requires wide, clear, bandwidth. As with any communication method, I recommend practice if speed is desired. Practicing while your life-giving supply of 87- (or residual 100-) octane burns out is too late.