All TOI or any "system" does is get you in the ballpark, and distracts your conscious mind.
The contact point needing to be struck for some shots is quite tiny, and there's really no way to "aim" that accurately, given the mechanics of any shot. Your eyes are too far away from the cue, and even if you could look directly down the cue with a sight on it like a rifle, it would be tough to hit that tiny spot every time.
Every great player relies on instinct and muscle memory and angle recognition. If they're selling you a "system" they're doing it to make money.