micromobility - Ebikes, scooters, longboards: Whatever floats your goat, this is micromobility

There's nothing saying a properly engineered foam wouldn't behave exactly as well.

I posit to you that a pneumatic tire is exactly the "properly engineered foam" you describe: a closed, single cell foam with a substantial enclosed volume, leveraging the high tensile strength and toughness of its steel or Kevlar threads for the cell walls.

I'm also no physicist, but minimalist engineering would tend toward reduction of mass and surface area. Multi cellular foams need to expend material for the inter-cell walls. A single cell of equal volume and similar material has only its single, outer cell wall. Plus, just because a cell encloses a smaller volume doesn't make it any stronger than a larger cell, so no advantage is gained nor lost by having a single cell.

Can a multicell foam be used as a tire? Of course we can press it into that use. Humanity has made concrete float, after all. But will foam be superior in cost, strength efficiency, weight, rotational intertia, roadside repairability, or in-field tunability by changing the air pressure? No. Instead, as the renowned cyclist described in the earlier link, an airless tire would have to compete on its strength of damage resistance:

They might make sense is if you commute a short distance to catch a train, and a flat tire would mean missing the train and being very late to work.

This type of scenario is no different for an acoustic or electric bike, and so there's no apparent reason that ebikes should necessarily prefer airless tires. The pneumatic tire's speed and range benefit still make it the preferred wheel technology for most automobile, bicycles, and airplanes. In space, that's a different question altogether.

Eventough you are getting downvoted I'm going to have to agree with you.

Not to say air tires aren't currently better than foam because they probably are. But like you say, there is probably some foam that can be better than air. Air isn't magic, but it is good at its job.

Thst is a design advantage, I'll grant you that, but it seems way less practical than a normal wheel.

Folding phones does bring a practical use to the table, you get a phone that you can fold out into a tablet that fits in your pocket.

To be fair, flip phones prevent unwanted user input and protect the screen.

Vehicle culture is just generally different here in the United States. Even if sane, rational rules for ebikes were to be established they'd be ignored out of spite. For any idea of the quality of individuals I'm talking about, yesterday I saw two separate vehicles enter the bus station by passing the "DO NOT ENTER" sign, realize that the road they were on wasn't going to their fucking hotel or wherever they were heading, drive up onto the pedestrian portion of the bus station, turn around, and leave the wrong direction on a one way street. Speaking specifically for bicycles I've been doing trail maintenance and had a mountain biker come at me screaming because we were out there working and were in his way after he passed a sign telling him the trail was closed and climbed a fence we put up just after the sign as a result of previous and similar incidents.

Edit: I should probably clarify what I meant by 'on mountain' that's just kind of shorthand slang for the property controlled by the local ski resort. Though the feds have similar rules, so buying an electric mountain bike around here is stupid since all you've done is spent at least another $2,000 on a bicycle you can't legally use outside of your private property.