Most of us were brought up, professionally, with an idea of "deep tissue" and the need to "break up adhesions," "stretch fascia," and generally "fix" the meat and bones. Along the way, some of us discovered pain science, neuromatrix theory, and the realization that it is the nervous system that creates tension, creates the sensation of pain, and it is through the nervous system that one corrects it. We came to understand that manual therapy works not by mechanically altering muscle, facia, posture, etc., but by influencing the nervous system.
Modern pain science has found that the more the nervous system is subjected to nociception, the more sensitive it becomes. Therefore, we avoid creating pain.