I suspect it gives more than a reset,
All the Pi Devices have a reset button with exception of the Rev 1Model B as far as I know,
In all the Pi's I've added a reset switch I have connected the 2 pins together, however the Pi 3 , I found that I needed to connect the Run to Ground to perform the reset,
I see the latest J2 header on the Model 4b has 3 pins, Im not sure if one is a ground, but i suspect connecting the run to ground would perform a reset,
I would like to find better documentation myself on what the 3 pins are, and the "proper" way to perform a reset..
Hopefully someone here can give us a clear answer?