Maybe I have low testosterone levels, or some other disorder that makes me less of a "manly man", but I just can't figure out this fascination with +P ammo.
It could be that I have a bit of an obsession with doing things "by the book". I figure that the designers built a gun with a comfortable safety margin for its designated ammo. Using higher-pressure loads decreases that safety margin considerably, produces increased recoil and muzzle blast, and batters the gun---all for another 100-200 fps. I have to ask: if the gun/caliber combination doesn't produce the performance you seek, why not step up to a higher-performing caliber? What is the fascination with "pushing the envelope" and "wringing out every smidge of performance"? As Mr Spock would say, "That does not compute".