I’m using a Caldigit TS3+ dock with a MB Pro where I’ve connected an external monitor. i also have a magic keyboard and trackpad. As long as I’ve connect the TB cable from the dock on my laptop, the screen light up immediately, without having to open the laptop’s monitor. Also the magic keyboard and trackpad are connecting immediately with the laptop via BT without any probing.
I’m not sure if that can happen with simple usb-c docks, but It definitely work with the TB3 docks.