It is really nice to have video span, if not the entire viewport, most of it, with the timeline down below. 16:10 gives you a nice bit of control area.
But 3:2 is even better. Hell, give me a 5:4 screen—I live and die in Figma all day, working on mobile app mockups. Which are very tall, obviously, and get awfully small on these HDTV-ish aspect ratios.