Condensed version: For all but short shots there are more needed cut angles than can be practically defined by aiming systems. More or less feel is needed depending on the shot distance and the "granularity" of the system (number of clearly defined system angles).
I assume you're talking about Poolology here. I'm not familiar with it, but it sounds like a unique kind of system that might be a better-than-usual tradeoff between complexity and granularity.
I agree. And yes, I was talking about Poolology. Knowing when a shot is dead on or very close to a reference aim line without having to guess or estimate the angle is pretty handy. But the system does require a player to develop a feel for fine tuning when needed, mainly when the ob is more than 3ft or so from the pocket, as you've pointed out. Oh....and I like the term "granularity".
A great way to fine tune any known reference aim line is to use your ferrule as a gauge. For example, aiming 1/8 of a ferrule thinner or thicker when needed equates to about a 1.5° adjustment in aim. So if you know 100% that a shot is a touch thinner than a 3/4 ball aim, or a 1/2 ball, or a 5/8, or whatever known aiming reference line, then you can adjust that quite easily by aiming 1/4 or 1/8 of a ferrule thinner. A 1/4 ferrule adjustment is about a 1/16 fractional aim difference (~3°), and a 1/8 ferrule adjustment is about a 1/32 fractional aim difference (~1.5°). With practice, this can be so fine-tuned that's accurate enough for almost any shot anywhere on the table.