A panorama roof is not a new concept. Here in FL, the last three cars we have owned had them, and when the shade is left open, the car bakes. If the shade is thin and flimsy like our Audi A3, the car still gets hotter than the equivalent car with standard roof. I don't think Tesla has invented any new technology for heat and light rejection.
IMO, if you live in very sunny climates, a sunshade is a must.
IMO, if you live in very sunny climates, a sunshade is a must.