This accident is scarying, particularly by 2020 standards. I know, it's Romain Grosjean - only rivaled by Pastor Maldonado and (further in time, may he rest in peace) Andrea de Cesaris (ma, Guy Ligier, c'était juste un pétit tétakou... !)
Last time a F1 burned this spectacular was Gerhard Berger, Imola... 1989.
Admittedly - Verstappen (Jos, the father, not his son Max) 1994 in Germany but the car was standing still in the pitlane, it was merely a flash fire.
Last time a F1 broke the guard rails is even further in time, perhaps the very gruesome accidents of the 70's - Koining 1974 (beheaded, the horror), Cevert 1973 (cut in half) ?