Forum:KB:Life support Sytem in TIE/fo

I recently did some reasearch about the TIE/fo space superiority fighter on wikia as well as watching the movie Star Wars: Episode VII The Force Awakens again. Even looking it up in the Visual Guide didn't gave me the answers I was looking for. When Poe Dameron and Finn hijack the TIE/sf from the hangar bay aboard the "Finalizer" they do not have to wear life support suits to use the vehicle. Also in TFA it is clearly seen that FO pilots wear life suppport suits while piloting their TIE/fo's and TIE/sf's. But the Wookieepedia article says that the FO TIE's had life support systems. My question now is if the pilots wearing proper life support suits is just a rudimentary detail or just a "backup solition" in case the fighter's life support systems get damaged?