Calling out "on your left" just startles people and confuses them, as the article points out. I slow down to the pedestrian's speed and talk to them, every time.
It's surprising how many people get startled when a bike comes behind them. I ding my bell, and I talk to them, and sometimes they still jump.
Why? My theory is because they're so used to bicyclists blasting by with no regard for safety.
Look, I'm not saying that anyone here rides like that. My concern is that a couple years from now, e-bikes will be prohibited from riding everywhere but the street.
Our highly considerate actions are one of the best steps we can take to help us gain/keep the access we desire.