I think that's why RJ the bike guy did so well on YouTube,
I love RJ The Bike Guy, he's my go to guy for bike maintenance.
I found those videos you posted interesting, the guy came across a bit weird at first but he grew on me.
Interesting bit in the comments on the chrome bike:
"As an ASE certified advanced level specialist, we are trained to never solder wires together. It creates resistance in connections, and can cause failures from heat. If you notice on all wired connections in vehicles today, they are all crimped connections with no solder. Some connections are spot welded copper to copper with no solder. The only solder used is making connections to circuit boards. I have repaired many wiring issues due to soldered connections. Most of which being on Harley Davidsons "customs". Some people never learn."
The way mountain bikes are going with their tiny chainwheels (and no room to fit a bigger one) does not bode well for hub drive conversions in the future. We will all be stuck with 10-15 year old mountain bikes if we want disc brakes and a 42/44 chainwheel. And I have absolutely no need for a 12 speed cassettes the size of Alan Partridge's dinner plate.
No wonder most people find it easier to just buy a ready made e-bike.