Should work fine, although I found connecting 4 bluetooth controllers at once to the LCD deck didn’t always work reliably. The OLED model has a better wireless chip, so this shouldn’t be an issue. The OLED model also supports waking up when you turn on a controller, but this only works if the controller supports bluetooth low energy (BLE). Xbox controllers do, but if you’re using a different controller you’ll need to check if it supports it or not (if you want this feature).

Dock’s have become much more reliable. The official dock is overly expensive imo, but it recently was updated to support CEC where the deck can turn the TV on and switch inputs to the Deck, which makes it a lot nicer for Docked play. I don’t know if any of the cheaper 3rd party docks support CEC yet.

You mentioned switch emulation, but not all switch games run well. You’ll need to check on the specific games you want to play.

When emulating, the Deck’s built in controls will usually default to player 1. You can rearrange the controller order in both the quick-access-menu (on the deck press the “. . .” button, on other controllers hold the “home” button and press A), and in the steam input menu.