And I'll bet we no longer make the April 5, 2063 Vulcan flyby, meaning first contact will be delayed, and humanity will never form Starfleet and we'll be powerless to stop all the other terrible things from happening in the galaxy. Gene Roddenberry was a temporal terrorist after all.
The Bell Riots would have happened if Biden stayed in the race, and we were looking at Trump/Vance being in charge for four years. Biden changed the timeline.