Firstly, when you turn on the Deck while it is connected to a monitor, the display will be scaled incorrectly and it will make only a part of a screen visible. I have to replug the dock to fix this, and even then this not always work.
Secondly, it doesn't automatically switch to my speakers that are connected to the monitor, I have to do it manually.
Thirdly, if I put the Deck to sleep while it is connected to the monitor and then wake it up, the Deck will crash after few seconds.
Uhhh... Fourthly? The gaming UI matches the monitor resolution but the game can't output higher resolution than 1280x800. There are no resolution settings in gaming UI.
Lastly, half of the time unplugging the dock while the game is running will crash the Deck.