Have you ridden an AWD ebike? If so, perhaps you didn't have it set in the best PAS setting. While my experience on them is limited, it has been nothing like what you have described. You are only making an example of one scenario, and one that may never be an issue for some riders. It sounds to me like your premise is that the AWD ebike will be used as a mountain bike would. For some that may be the case, but here, I think we're talking about a hunting application. For me specifically, I'm using it to get to the middle and back edges of places that are otherwise too far to walk in and haul out. The hunting pressure in the front areas make it undesirable.
I can assure you that AWD (using two motors instead of one) makes a tremendous difference when climbing hills. I've tried single rear, single front and AWD. Two 750w motors can accomplish twice the work of one, and mine can climb a 30% incline with 100% PAS and no input from me. My front tire doesn't bounce off the ground "all the time". I don't recall that happening once yet. Perhaps you have forgotten to consider the weight of the front motor and the position of the battery and it's weight. Maybe also recognize how Pedal Assist works, along with torque/cadence sensors and throttle controls. And there is the ability to set the amount of pedal assist for each pedal assist setting. I have mine setup in 0-5 PAS. In PAS 1 i have 15% assist and go up gradually, and in PAS 5 I have it set to AO. As speed increases I increase PAS. As I slow down I decrease PAS. When stopped, I'm in PAS 1, and my take-offs are quite easy and there's no spinning of tires, as you claim. When I get off the bike I put it in PAS 0.
Ebikes are not ATV's- that is correct, and they were never intended to be ATV's. They are bicycles with electric motors. Various states establish codes for where and how they can be used, and what power limitations they have for different areas. For example, my state code mandates that use in DWR lands limits ebikes to Class 2 requirements, which limit the speed of the bike and power of a motor. In public spaces not controlled by DWR, ebikes must conform to no greater than class 3 limitations, and all ebikes must be affixed with a decal indicating it's class. For ATV's; however, imposing such limitations on them would be unrealistic from a manufacturing perspective. And ATV's pose the potential to introduce something in to the DWR environment that is largely unwelcome- noise, negative affect on terrain, speed, potential for injury, etc.