I have a solid and clear recollection of the good, which is useful from a business management and engineering career perspective. Literature retains on the first pass, which is very useful in operations for manual/business requirements/security framework ingestion, and I don't need to keep a TODO list or agenda (but still do for transparency's sake to my reports and superiors). Having an excess of information readily available gives a lot of opportunity to drive impact, and has allowed me to move vertically in my career very quickly. There's a feedback loop of retaining information, which presents me as more qualified to offer support to my peers, which puts more people in my direction soliciting input and building a positive reputation. With that, I made leadership in my early twenties, and it feels like it took less effort than some others to get here, based on what I've heard from other people.
Unfortunately for me and I'm sure others, I've been through a lot, and all of that retains just as well. It's not an active decision to retain. I'm not going into much detail on those events, but I've encountered about a dozen substantially negative events in my life, and having the information for those who've needed it has been helpful when necessary. It's been empowering to revisit those moments from a different angle as I've worked through those challenges.
All in all, not to be too cliche, but it's both a gift and a curse, but one I'm grateful to have.