All good points Matthew and I agree with you on everything you say.What I particularly like about mid-drive is that it is never overwhelmed by the 'hard' bits of a ride: I can always go down a gear or up an assistance level, and the most important aspect of ebiking for me - cycling with the hard bits taken away - is always true.
I don't agree with the higher efficiency point. Yes, the peak efficiency is higher for a hub, but if you look at the average achieved efficiency over a real world journey then I suspect there is little difference. The hub is only working efficiently in the upper half of the speed range. Below that it drops off a lot, whereas a mid-drive with the gears properly used is always in its efficient range.
I have always wondered about the benefits and advantages of mid dives over hub. This is one of the reasons we designed and manufacture the only eBike in the word (that we are aware of) that gives people the choice of both on practically the same frame. 50Nm Hub Drive and 100Nm Mid Drive.
Whenever we can we get customers try both before making the buying decision. In the majority of cases people come in to buy the mid drive, try both, then leave with a hub. We sell thousands of Wayfarers and interestingly the ratio between hub and mid drive sales is about 25% mid 75% hub.
Based on our experience and sales figures we believe that although the mid drive is superior in some riding conditions especially off road with steep inclines, overall the hub drive is actually better for the majority of riders demands and needs.
All the best, David