I think the video shows a lack of experience. He's thrilled about the lightness of the Quick Haul. Lightness would have great showroom appeal, and if there weren't important tradeoffs, there would be other light cargo bikes. With pushbikes, it has been found that bike weight makes almost no difference in travel time. Bike weight is a relatively small part of gross weight, and by the time you get to 15 mph, the big problem is air drag.
He won't consider Class 2 because he wants 28mph to share the road with cars. If they're going 28 mph, that could be much better than 20 mph. It won't matter so much if they're coming up at 60.
An upright bicyclist hits a lot of air drag at 28. Rolling resistance would increase the requirement to about 900 watts. None of those Class 3 bikes claims to be that powerful, and 900 watts won't hold 28 on rough pavement or hills. His battery might not get him to town and back at 900 watts. At 700 watts, the Globe Haul might flirt with 28 if he pedaled hard.
My first ebike was advertised at 750 watts but put only 500 on the wheel. Another controller doubled it to 1000 mechanical watts. It would quickly take me to 24 mph, that motor's limit on 48 volts. That's almost like Class 3, and the throttle would hold that speed if I stopped pedaling. I exceed 20 only a few seconds per week, to get as far as possible on a stretch of narrow 35 mph road before I spot overtaking traffic in my big, flat mirror. I make my bikes as stable as possible, but I'm still sitting high on a bike with a short wheelbase and a high center of mass, unlike a road motorcycle. Higher speeds increase the risk of being thrown on my head. They also increase the risk of a crash because a driver didn't notice me in time.
I love the seat tube of the HSD. It leans back even farther than my Abound for a more comfortable, more stable ride with better leg use.
He loved the Abound but dismissed it because it's not Class 3. Mine takes me to 22 pretty fast on flat ground and 20 uphill. Riding daily almost 3 years, I'd wanted to upgrade to Class 3 until I bought the Abound. Now I think a good Class 2 is in practical terms as good, and it's probably safer not to flirt with another 6 mph.