It's about "how can we improve the security" for everybody. That's why I think it's so important that penetration testers should lead by example. Apply proper operation security procedures themselves.
Recently my first Pluralsight course was published, operational security for penetration testers. It deals with what opsec is, and how to apply it to your penetration testing workflow. The trailer of the course can be found at https://www.youtube.com/watch?v=DSF6XbCxYGY. The course itself can be found on Pluralsight's site, https://www.pluralsight.com/courses/opsec-penetration-testers
As beautifully stated by the third law of OPSEC: "If you are not protecting it, the adversary wins".