What we need are chain[s] and sprockets lasting more than 10K miles like on motorcycle.
like on motorcycle.
Bikes to pedal, which are what most of us reclaim to build our ebike, were designed towards minimizing weight while still having a system strong enough to hold up to big strong pedalers. As such they will never be strong like manufactured dirt bikes [motorized] & motorcycles as far as components holding up to some >10x the power input when used on the OEM bike drive train et al. This is our existential situation as choosers
of modified street bikes for ebikes unless we can find some manufactured "bike" out there that was designed to be motorcyle but the designers simply left off the motor and added a petals-drivetrain.
You might think of the Greyborg Ebike Frame as such a frame but there is place for such frames. But until those ebike builders, like perhaps you?, get rid of the entire petal bike drivetrain on your home built ebikes, you carry the weaknesses of the OEM pedal bike drive train. I can accept this weakness, which you appear to have suggested as a weakness, but if I wanted an electric motorcycle-ebike I could have bought one or build the likes of one. And so, I challenge your view of What we need
as applied to my needs as I am sort of satisfied with the OEM performance as everything has a price tag. And yes my riding skills on rough hill climbs give more abuse to the ebike than its OEM parts can take. As I see it, lower your expectations or change[out] the parts. I have lowered my expectations of what this ebike can do on hills -- really I can push it uphill with power assist on these difficult hills.
And yes, your point of view as an ideal? OK, OKAY
A well tuned torque limiting clutch on the OEM ebike drivetrain may be the answer to preserving the the OEM drivetrain while while letting the rider try his hardest to abuse it.