I don't follow. Every time I drive my car I release the parking brake. On the cars with electronic brakes, you use a button rather than a lever. I'd do it the same way to service the brakes.
You typically need the piston fully retracted to replace pads, which very rarely happens just by disengaging the park brake.
If you are old enough to have changed a manual handbrake pad, you normally had to screw the piston back in before you could fit the thicker new pad with a "caliper rewind tool" even if the handbrake was off, the electronic parking brake service mode essentially does this for you, or unblocks the piston permitting a rewind tool to work.
