Your post has me looking back at the opt-in samples of my experience and realizing that when they were opt-in, I never considered them to be "pair programming". It's always just been "healthy onboarding" or "healthy collaboration". My current org's obsession with enforcing PP for its own sake as a measured performance metric has conditioned me to squirm when I hear the term, but that's just a branding/emotional response problem. Thank you for the beautifully articulated check.