Think about the psychics, you remove all the steel of a delivery truck and replace it with plastic. Of course its going to be more efficient. Since it is like a bike, it doesn’t need a roll cage.
With last mile delivery, you don’t really care about the top speed of a vehicle. But how fast it can accelerate. With an electric motor and regenerative brakes, you could compete easily with an electric van. After all, there is less weight to propel.
How hard can you grab your brakes and shed momentum when stopping an e-cargo bike traveling at 25-30 mph and with 750 pounds of cargo plus human? When do bike tires lose their grip on dry, wet, icy, and sandy roads?
I've driven trucks with 1000-3000lb loads. I understand how handling changes between vehicle types (different masses and 2 vs. 4 vs 6 wheels). My experience is why I advocate for specialized training and licensing for class 3 e-bikes and cargo bikes. I also suggest cargo bike training should include securing and balancing a load because I've seen too many improperly secured loads by idiots putting themselves and others at risk.
The vehicle the OP linked has a cargo rating of 375 lb, not 750, and a top (assisted) speed of 15 mph, not 25-30.
In the US we don't require special licensing to drive box trucks up to 26,000 lb GVWR, much less a few thousand lb like you're talking about. Requiring licensing for all class 3 ebikes (speed limited to 28 mph, vast majority carrying little to no cargo) would be absurdly disproportionate.
Think about the psychics, you remove all the steel of a delivery truck and replace it with plastic. Of course its going to be more efficient. Since it is like a bike, it doesn’t need a roll cage.
With last mile delivery, you don’t really care about the top speed of a vehicle. But how fast it can accelerate. With an electric motor and regenerative brakes, you could compete easily with an electric van. After all, there is less weight to propel.