I do no tlike their version of upright at all. To me it seems a very unstable postion. That might be fine for trips on nice near perfect sidewalks lasting a couple of miles, but first pothole or surprise and you are going dowwn.

I've never ridden a bent, but I'd find that far preferable.

Also with a more traditional posture, either street or mountian bike yuo have options. The very straight bike seems to me to provide no way to change position. Again fine for rides short enough to walk, and fine if a bike is nothing more than a faster way to walk.

But for me position options is important. I'de be uncomfortable trying to watch a half of football in a comfy chair if I was not allowed to alter my position.