Very well put.
Now let me explain this from an entirely different angle. 8x10 photography inherently involves depth of field compromises. Crunching numbers will only take you so far. You need to learn how to strategize depth of field in a compositional sense, intelligently, for sake of the specific image itself, rather than rely on rote formulas. Some scenes might be amenable to very crisp overall plane of focus control, especially if wide angle lenses with their greater depth of field are involved. But in most cases, I find myself prioritizing certain things in the picture which I want the viewer's eyes to instinctively focus upon within context of a much richer cumulative print. I often do this by carefully nuancing the critical focus. Please do not confuse this with the notions of either soft focus or what small camera tele-photographers term selective focus. It's a lot more subtle, but allows me to strategize big highly detailed prints. Nothing is more disconcerting than these new huge digitally stitched panels where everything in the scene is artificially equally sharp. Human vision does not work like that. Vermeer would roll over in his grave. The eyes survey, select, re-focus, and prioritize; and any intelligent composition should assist that process.
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