There is no disputing that having multiple gear ratios and mid mount is better for climbing than a hub motor. But, there is a reason why most of the mid mount motors on bicycles/MTBs are limiting their peak watts to 1100 or less with bicycle drivetrain components. The best bicycle components can't handle more than that. Now a 420 pitch MC chain could be the way to go for mid drive, but then you wouldn't have multiple gears on the rear or a derailleur to handle that. Hanerbrink offers an X5 electric motorcycle, but that can't be compared to ebikes. The X3 and Bearcat can though. But their mid mounts are only rockin 750 and 1000 watts respectively. Same with Optibikes, running a BMX chain to Roeloffs hub which btw, a BMX chain is much better for mid drives, but still can't handle more than 1100 maybe 1200 watts. For mid drives to become a viable bicycle option running 5000+ watts, need to use a motorcycle chain, and if running an internally geared hub, there are none in existence that could handle 5kw on a mid drive, unless the final drive gearing was extremely tall. I wish the industry would make a heavy duty internally/planetary gear 3 speed hub with about 400% ratio difference between 1st, 2nd and 3rd specifically for motorized mountain bikes with 420 pitch chain and sprockets for pedaling and primary drive connection. That would be the solution.
EFMX, very neat video you posted, did you have a hand in making that?
Rick