Yes, you could be the outlier that actually use fat tire e-bike for their designated purpose, I don't doubt there are others like you.
What I understand is that bike companies profit from what sells; sex sells, rugged image of bicycle rider sells, people like to imagine they could be an "outdoors man" sells.
They sell because people don't realize what it's like to operate a fat-tire e-bike off-road for extended amount of time, but like the image in their head that they can have an e-bike that's capable of it.
I'm glad that fat tire e-bike is working out for you.