A lot of people wear earbuds while walking, so there is a chance people don't hear you at all. As Smaug said, the problem could be resulting confrontations. I used to live in a suburban area where there is a 30 mile+ paved bike path along a river. There would be groups of people who deliberately walk abreast to block the whole trail. I rode a mountain bike so I would ride offroad around them. Many of them were groups of single ethnicities such as Russians or Samoans, we're talkinn 10+ large people. They would most certainly cause physical trouble if someone blared a horn at them.
That is next level entitlement right there. Maybe they don't read English, so you could translate a photo of a sign for them, pointing out that it is a SHARED path...
Then, there were the yahoos who give all bikers a bad name. They were competitive riders decked out in their numbered spandex suits, riding multi thousand dollar road bikes. They would fly by doing 40 mph within inches of people walking. It was such a problem the county installed 15 mph speed limit signs along the path. It didn't help since this was a fairly rural path with a couple miles between access points to roads.
Well, two things about this. As a card-carrying member of The Spandex Crowd, I can tell you that most of us would never do this. We ride in a group and we are certainly the 2nd-fastest ones on the path, without even trying. We're typically going 12-15 mph and we always shout out "coming up on your left" or something. Or we shout: "Walkers up!" to each other, loudly enough that the walkers can hear us. Maybe not all bike clubs or groups of riders are so courteous. In WI, this is what's required of us. Keep speeds reasonable and announce our approach. We are not responsible for being heard over ear buds.
Walkers are to stay to the right; there should never even be a reason to NEED to announce our approach. What I like is when we announce it, and they give a sign of acknowledgement, like a thumbs up or a wave; then we know they're not going to swerve in front of us.
We find that a lot of the time, if we shout the brief "On your left" walkers will WALK left, right in front of us. I find an old-fashioned bell, the kind with the machine gun ring, to be the most effective. It seems to be heard through ear buds much of the time, but without seeming rude, like a horn may be. Some of us just gave up on announcing, because it causes problems as often as not.
Some road cyclists also are passive-aggressive and will execute a close pass on pedestrians who are not yielding or staying right. They don't have to be going 40 for it to be scary, but being a bit scared is the point, I think. They're just damn sick of pedestrians acting entitled to be everywhere. I don't condone this bully mentality. It's the same mentality as the motorists who want to teach US a lesson for daring to ride on "their" road.
I guess my mission in typing all that out is to point out different mentalities, differing points of view. You seem like a reasonable person, CoffeeandBikes, but don't have the viewpoint of a road cyclist.
Young eBikers have a different viewpoint.
Soccer mom-type pedestrians have another viewpoint.
Mature eBikers (like most of us here) have another one, etc.
I try to be a good ambassador no matter HOW I'm using the MUP. Same on the street. I signal, I stop at lights, slow down at stop signs I smile and wave to people. Escalating rarely helps, and when it does, it makes someone feel bad or bullied. It's why cops are trained in de-escalation these days. One has to swallow one's pride and righteousness.
I even go a step further. I wave at throttle-type eBikers (as long as they're not engaging in jerky behavior at the time) when I'm on my road bike in a club ride. I say hello or give a little wave to oncoming pedestrians. I'm a MUP goodwill ambassador!
Prior to us moving the situation seemed to escalate year after year. It was a combination of family members who were sick and tired of the road bike guys almost hitting them and their children in strollers and just some bad elements. On top of all that there were many people wearing earbuds who certainly couldn't hear a regular bike bell or horn. They would jump in surprise as I rode past them (slowly, usually.)
We really need some friendly cops on eBikes to go around educating people.