Big display, keyboard, docking station
You either didn't read what I wrote, created your own understanding for the sake of your argument OR simply didn't understand parts of it because you aren't update to date on emerging tech. Regardless, you are miss understanding the whole point.
The point is that the tech that in your pocket can replace your desktop PC and even laptop. Displays will no longer be required with augmented reality sets. The only issue left is handling input devices. With AR you don't need a mouse but you still need a keyboard. There are pocket size keyboards that unfold into a full keyboard. They provide feedback but none mechanical like an actual keyboard.
So to sum it up, the only questionable item at this point is whether you want to carry a full mechanical keyboard or not. Once processing power is sufficient (and it is for some applications), you no longer need to buy a tablet, desktop or laptop since you have everything in your back pocket. Additionally you could argue that televisions and speaker systems are history. Read up on AR and you'll be surprised at what will be available only 3 years. The market expectation is that by 2022 at least 10% of the population will be wearing at least one smart tech item.