There's nothing wrong with keeping score, it can give you a feel for where you are with your general shooting. Useful. It can make a day of 3D with friends a great time, especially if good-natured ribbing is included. But if score is THE most important part of your shooting experience then instinctive probably isn't the best choice for you. A hard (pins) or semi-soft (gapping) artificial sighting system is a better fit, since THE most important objective there is to achieve perfect hits (perfect scores) with every single shot. Some won't admit it or will try to deflect the obvious, but shooting for score, by design, is built around the eternal quest to obtain dead center perfect hits. Anything less by default constitutes a measure of failure, to be corrected with constant concern/tweaking of form components, gear or mental approach. This becomes the fuel that feeds the circular quest, and if you like that sort of thing then there's absolutely nothing wrong with that. Personal choice is'all. It's a fact that artificial sighting is far more more productive on targets. It's essentially a carefully controlled paint-by-numbers machine for meeting the objective, and as with any applied mechanics it is quite effective towards that end... if that's what's important to you.
On the other hand, instinctive shooting is BY DESIGN less perfect and harder. It's supposed to be that way. You'll either like/accept the extra challenge or consider it as romantic rubbish. It won't compete as well or make you famous on the 3D circuit. It's a great 'target' for chat site ridicule and it won't get you into the Olympics. But if your personal 'painting preferences' align more with the imperfections of an open canvas than the repetitive certainties of numbered paintboxes well then welcome to the cabin of instinctive romantics, lol. Coffee's on, help yourself.