The goal of technique is to free, engage and particularize instinct. Some "naturals" can, at least theoretically, get there without technique. But the goal of technique is to reveal, free, engage and particularize instincts.
One might for instance have the instinct to drop to the floor and grasp the Earth in a scene, but perhaps only if one has done one's homework in script analysis, character development, understood what the character wants and what the characters "target" is, charted one's thoughts and superobjectives (using one's own experience as well as one's imagination), specified the obstacles, the character's blind side, the character's tragic flaw, the characters archtype (and perhaps drawing it, Michael Chekhov) found the character's center of gravity and or Meisner repeated with one's scene partner... to name just a few things.
On top of which, instinct of course comes into play in much, perhaps all, of the technical work that leads to that instinct to drop on the floor in rehearsal. To name a quite obvious example, identifying a character's center of gravity can come, even quite literally, from the actor's gut.