1 wind will cool an electric grill just as quickly as gas or charcoal BBQ. Depends on location and design of the cover, ventilation, etc, not the heat source.
2 to be a BBQ, (where I live) it won't be electric. That would be a grill.
3 I used to buy a $30 sheet steel case, propane BBQ at Safeway and it would self destruct within a couple of years. Got tired of that after 3 or 4 iterations so bought a Dickinson Sea-B-Que, (small size) on which the burner failed after 10 or so yrs, replaced with the same model (replacing just the burner comparatively too expensive). More money per yr avg, but cooks better, looks better, easier to stow.
4 Never had, nor seen, a propane BBQ flare up. Have seen charcoal flare-ups, but I agree with psneeld on that subject. Saw boats burn to the water line from Alcohol stove flare-ups, twice. Those are far more dangerous IMHO. Also seen cars with burned hoods from carb flare-ups, even without brainless added gas. ? When are boat engines (gas) going to be all fuel injection?
5 I use a 5 lb propane tank on mine, and where I keep my BBQ and tank, on the back cabin top, just aft of the main cabin, is always out of the wind when anchored, but in a raft can get windy, so can easily be moved to a more protected spot.
6 I enjoy reading most of this forum, but some degenerate to p*ssing contests that get rather tiresome.