Ok. So my personal head cannon has always been that Exos are humanity's attempt to create immortals. They made self healing robotic shells then either transferred or copied a human mind in to the body. We know that the number next to the Exo's name is the number of times their digital memory has been wiped (I think that was made cannon?), but why were they wiped? Are they like a human mind? I'm pretty sure there's a limit to how much the human mind can hold (120 years or so of memory right?) So do Exos have their memory wiped after that amount of time?