No worries and appreciate the question and discussion. No issues w/ DIY not being your thing. Totally understandable.
back on topic - why this is potentially misleading in my mind. Not likely it’s intentional, but when you don’t see anything except the rider’s shoes you have no idea on the load/weight the board is carrying. So when smaller asian riders are half my weight - i watch this video and think i too can go up that incline (which i couldn’t). Not likely it’s intentional, but definitely worth noting as folks get excited seeing these videos of them being ridden.
I don’t have any issue whatsoever with chinese companies or components. Most of what i use in DIY is made in China. It’s all in the QC and overall quality of what’s made. Good feedback here and elsewhere let’s me know if it’s worth the $. Some things are more $, other less $ and a good value - regardless of where made.
The E-Go is a really well proven board, which is why i suggested it vs this less-known Koowheel.
Now the single belt motor vs hub motors. This is where others likely will disagree, and i welcome their input to give you some perspective.
A geared motor will allow for gearing below 1:1. Those ratios (i usually aim for right around 3:1(3 motor : 1 wheel)) equal torque, acceleration, and hill climbing ability - with less top speed capability (i’m ok with that compromise).
Dual hubs is a great option, but it definitely may not out perform a single belt/geared motor for hills and acceleration. It should do well on the flats assuming the same rider weight, but likely will suffer poor performance up hill where the geared motor has the 3:1 gear ratio to help keep rpm’s up and keep power going to climb.
So depending on your weight, a hub motor(s) may work well, but i would set your expectations lower for hill climbing. Especially if you aren’t a light weight rider.
Now we should get the perspective of an expert - @LEVer - can you shed some light on this?