Not sure I agree with that. It really depends on both the rider and bike. You can get a lighter weight (obviously with less range/power) mid-drive e-bike that

Not sure I agree with that. It really depends on both the rider and bike. You can get a lighter weight (obviously with less range/power) mid-drive e-bike that is still manageable unpowered if you're not a small rider. It certainly isn't fun, but I've done it just fine on mostly-level ground with a sub-40lb bike. Note that I have fond memories of pedalling girls around on the back of my unassisted bike back in the day, so I might not be an average rider.