The protagonists of every single time travel story: whatever you do, don’t interact with your personal timeline.
The people of Winden: bump into their parents as kids, bump into their younger selves, talk to their younger selves to make sure they’ll become who they are, talk to their younger selves to make sure they won’t become who they are, become their neighbors’ ancestors, become their own ancestors,
I’m surprised I’ve never seen anybody make the criticism of the MCU that Thanos is a Mary Sue villain who has no weaknesses and just wins because the plot says so, because he 100% is