You seem to miss the difference between "developer testing his/her app" and "everyone testing every app". To the point, I'm using "/etc/malloc.conf -> AFGJPRX"

You seem to miss the difference between "developer testing his/her app" and "everyone testing every app". To the point, I'm using "/etc/malloc.conf -> AFGJPRX" on most of my systems, which means that virtually everything that runs there is checked. Can you easily do that on Linux? How many apps are you running via valgrind on a daily basis?