It's technically demanding to shoot in 3-D. It's an extra element. Also, just the size of the cameras. They look like these 'Transformers' monsters; they are incredibly big, many of them. ↗
I think you can really tell a good actor if you can put a camera on them and they can just talk and emote and react and you don't have to keep cutting away from them, because they are the language and the behavior. It's all a tour-de-force performance. ↗
Nothing could be recorded in those days except by aiming a movie camera at the television screen. It was at least another 10 years before they had any kind of recording medium. ↗
With modeling, you pose. You want to look your best all the time. With acting, you have to be aware of the camera, but the more you show your imperfections, the better you're going to be. ↗
Perhaps it sounds ridiculous, but the best thing that young filmmakers should do is to get hold of a camera and some film and make a movie of any kind at all. ↗