When cycling on shared use infrastructure I generally find pedestrians understand the meaning of a bell as a warning. Certainly some do become startled and move unpredictably, but if you travel at a low enough speed and bell with enough distance that this isn't an issue.

I regularly cycle on a very narrow shared use pavement which is directly beside a 40mph road. There is space to pass pedestrians, but I would consider it dangerous to try and pass without ensuring they are aware of my presence, even when passing at a walking pace.

A chime of the bell is more of a polite "I'm here" instead of a "Get out of my way!"

Where I live, there are different levels of "shared" and I would be very confused if a cyclist would just stay behind me instead of ringing the bell. It's different cultures.

shared infrastructure means exactly that.

If they're blocking a bike, they're also blocking other pedestrians. It's rude no matter what.