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V-r0cK said:
Didn't Nintendo themselves state that the dock was only a placeholder to connect to TV and to charge only?

Providing extra power to the system can mean a big difference in performance. 

https://www.videogamer.com/news/nintendo-explains-that-switch-dock-is-not-the-main-console-unit

"The dock is not the main console unit of Nintendo Switch. The main unit of Nintendo Switch is the unit that has the LCD screen, which the two Joy-Con controllers can be attached to and detached from. The main function of the Nintendo Switch Dock is to provide an output to the TV, as well as charging and providing power to the system."