On Steam Deck Civ7 is garbage, because there is no mouse emulation...

No mouse emulation, but the game is designed to be played with a controller, and this works very well. You can click the left stick/touchpad to toggle tooltips if they get in the way, and this patch (finally!) added the ability to center the cursor in the middle of the current view with the click of a button (not sure which button because I haven't had an opportunity to try the game with the latest patch), so no more having to drag the cursor across the map.

Steam Deck performance is also excellent, although I wish they'd use Steam Cloud to sync saves instead of having to use 2K Crossplay which can only be accessed from within the game.

Personally, it's the most fun I've had with a Civilization game since Civ IV.