Your from Australia and you saying i'am completely wrong well i don't cycle in Australia at all.
The terrain in Australia would completely different what is in the united kingdom some of the hills around the hills around the uk are similar like the tour de france and what you are suggestion for gearing and getting up hills with ease wouldn't happen at all.
Their is one hill around where i live even with crank driven bike it that long and steap it takes one cell of
battery to get up the hill.
First up I could have worded that better, I don't question your experience just your assumptions on unassisted climbing and power consumption with a crank drive.
A hill is a hill (assuming the same gradient), doesn't matter where you live unless its covered in ice
, there is a minute variation in gravity but close to irrelevant.
I live in Tasmania, in the foothills of a mountain. and there is almost no flat areas to ride due to how hilly the city is.
I ride up a long 12.5% grade hill to get home every ride, it has ramps of 20%, I then turn onto a slightly steeper hill which I can't find definitive gradient data for.
I also ride relying almost fully on the motor due to health issues, it climbs the above hill with out getting more than slightly warm IF kept spinning freely.
The power consumption is the measured power per km not a guess.
My trike has a BBS01 and as stated earlier 46 tooth front ring and 11-32 rear cassette with a 20" wheel.
I also have a Tonaro Crank drive with modified gearing that I use off road, keeping the front wheel on the ground on the steeper slopes or traction are the limiting factors not the motor.