if guardians dont remeber their past like how did cayde know he'd been reset 6 times before he was a guardian (sorry about spelling)
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i think they can only not recall their lives before being risen and becoming guardians. since isnt dying and having your ghost rez you a sort of thing covered in the story? but its different with exo's. they just suffer from memory degradation after so many resets. but thats why theres the number to their names so they know how many times they have been reset. not sure how they know but id assume its a process that involves a team of peoples help so maybe its just part of the process