I too am in the flip-up camp, especially in winter and/or long distance. 3/4 for non-winter short trips.
With the flip-flop I can raise the front so people can see my face when calling in a shop or for fuel, so if I'm still told to remove my helmet, I don't feel unreasonable by taking my custom elsewhere

I do think a built in sun shield is essential though

Too old to die young, too ugly to leave a good looking corpse