I think it is possible to trace the past and with enough data influence the future to go the way you want it to go, which in some ways is time manipulation but not so much travel. However if you are talking simulated realities then anything is possible within the boundaries of the simulation.
Why does such a grand fact not influence? because money, costs money to enact change.
Thanks for taking the time to read over this. Hope you have a wonderful day. <3
Manipulation or travel itself is just a different form of medium... I believe that timeline itself is linear in any given fork and the number is infinite. It costs moneybto start a war too. Why it is so easy then?:) Since it is deeply phylosophical it could continue infinitely :) I have genuinely enjoyed the read, thank you for sharing and will be waiting for other posts to dig in :)