The Deck can be compared to a laptop computer with specialized controls and a touch screen. It runs a desktop OS, with desktop programs and games. You can use

The Deck can be compared to a laptop computer with specialized controls and a touch screen. It runs a desktop OS, with desktop programs and games. You can use it as a normal desktop computer, connected to a screen and peripherals, and this is by design. The same can't be said of the PS; the PS isn't a desktop computer.