I think these mainstream OEM e-bikes are super cool but unfortunately, their price points are not consumer-justified. Many of these MTB e-bikes run $5K-$15K.....so, for SERIOUS cash-laden riders they are the sweet spot.
The RAD bikes or more consumer-priced bikes are making it attractive for just the average joes that either find or want to re-visit the joys of just riding a bike without it having to be an athletic event. I fall in that latter category.
The other experience I have is how with any other bike you are aware/obsessed with bike weight and adding any farkles that would add to such weight. Even in my triathlon days, I was still a 200lb guy so gravity sucks on the climb.
Now I have added racks, and cup holders, and light mounts and cell mounts and locks, etc and I ne'er have a worry about bike weight. I think my bike must easily weigh over 60lbs now. hahahahah But, with a twist of the throttle and PA2 or PA3 (out of 5), I don't struggle with moderate flat climbs and on the downhills with approximately 350lbs of aggregate weight my momentum is continuous.
My beast of a bike will not win any Svelte Bike Awards like that beautiful Rocky Mountain but the RAD is actively riding and not just desktop wallpaper. :)