Yes, and for that they would be useful. However, in such an environment, it will be exceedingly rare for you to need one of these, as you would have to contend with city-level traffic and have to go at least 1.5 km away to even choose one instead of a bicycle. They have effectively the same safety and cargo capacity as a proper cargo bike, as they are super tiny. For families carrying children, bakfiets would fill the same role within that small radius. Therefore this is for intra-city, entirely urban trips, specifically going to places where there are no tram or metro stations within a few hundred metres or when a very small amount of too-heavy-to-carry cargo has to be moved more than 1.5 km, which as we all know, is a definite daily occurrence. Weather is one thing it protects you from, but from what I see on the daily, that's not a big enough issue to wage war against city traffic for for most people.

I don't find a good niche for these to succeed other than in very small towns with integrated suburbs but then again people would bike for bike trips and buy a car anyway because they want to get out of the small town at some point. It's a great idea but it either comes with most downsides of L-class vehicles or it loses its niche entirely.

I saw some of these in “hill towns” in Italy. You have a 4sq mile town with cobblestones, steep inclines, and narrow “roads”. Perfect.

Where I live it’s common for people for buy £4k electric cargo bikes to shuttle <10mi/day to shops and schools. I can see the appeal of one of these over such a bike especially when they were only £6k: more weatherproof, less likely to be stolen, arguably more versatile.