"Form Follows Function" a basic design criteria. If you need a tall windshield to drive comfortably, then so be it. My grey roadster is a bit too windy at highway speeds. I tried goggles over my glasses but didn't like that. I have to drive wearing a baseball cap, holding it on with one hand. Since that isn't the best idea I built a different open car where I sit lower and more forward, out of the wind.
Your idea about a fold down windshield could be an answer. Like the air ride systems that provide reasonable ride height on the road and ground scraping lowness for the fairgrounds. Function on the highway, form at the show.
