I’ve talked about the difference between additive and subtractive techniques before. It even influences the semantic language editors use.
In Europe, specifically Britain, directors operating a switcher are or were called ” Vision Mixers” and the editors are or were referred to as “joiners”. Their process was obviously in the semantic sense more additive, and for a longer time than ours, partially because I think they tended to shoot a lot more wild sound, with unsynched sound there, depending more on Foley and Looping in post production.
Our American editors were called “cutters” from almost the beginning, and their task was usually described as “cutting away the useless bits and shortening clips that were too long”.
There is absolutely room for both techniques in any project, though it can be argued, the nature of the program may fvor one style rove another. In News production, for example, the deadline is everything, and the process concentrates on reducing away all non-essentials to get to the bare minimum that tells the story in the limited time slot, and to get that done before air time. You typically would lay down a core narrative from the reporter, a sound bite, more narrative, second bite, and a closing shot for voice-over. Those were your “bricks”. next, you’d go back thru your raw material and find the best visuals to lay over the voice track and transition to the “actuality”, (the interview quote). From there on, it would be all subtractive, shaving frames here and there and bumping things forwards and back until it was time to color correct and sweeten sound and ship it.
Documentaries often take the opposite tack and are more additive, though the director and editor generally have a skeleton of the story in their minds already. The “purest” sort of doc, IMO, comes from an organic process of letting the material suggest it’s own threads. The story is “found” in the edit, not pre-determined. Working that way these days is a luxury.
Theatrical and narrative television and film, anything driven by a script, is going to at least start out subtractive, in that you’re collecting the best takes of everything shot for the script. They’re bricks, labeled in the order they were meant to fit. It only becomes Additive when you run into trouble and have to fix something, or to enhance the flow of what was dictated by the shooting script.
All of these statements are relative, not absolute. You are “editing” the moment you pick up the camera and decide to turn it on or off. You are editing when you decide to show up to the scene or not. You edit when you decide what’s getting into your hard drive and what sits on the desk. In FCPX you are really editing as soon as you’re importing shots, by the way you tag them and apply metadata. In a sense, several rough cuts gave happened before you ever pay the first master shot down on the timeline. If it wasn’t shot, it never happened: that’s a conscious choice made about what to show and not to show – that’s an edit.