I may ultimately stay away from full face helmets, but surprise impacts like t-bones and rear-ends are precisely why I find full face helmets appealing. For one, I can't really control how I fall in a surprise crash. And two, I'm less worried about the initial impact, and more about being slammed into the pavement. Especially from a higher center of gravity like I have on my standing scooter. Being rear-ended and slamming my head back against the hood of a car will hurt, but my current helmet will probably suffice for that. Being slammed forward into the ground, it seems like my face will become very familiar with the pavement.

Another instance that a full face helmet seems appealing is in in getting doored. I often don't have a choice but to ride near a bunch of cars parked on the street.

Road cycling enthusiasts are a good reference point, but the differences I see are in that I am not as focused on being aerodynamic and lightweight, since I have an electric throttle doing 100% of the work for me. In the tradeoff between efficiency and safety, I have the luxury of leaning much more into safety before negatively impacting the ride itself very much. Most of the negative impacts of additional safety gear are on either end of the ride (gearing up and down)