That’s not what Eren did. What he did was command Dina-Titan to skip past Bertholdt. Dina was finna give the Bane treatment to whomever was next at bat. Bertholdt can’t die, yet, so Mommy is next course. People are really interpreting what Eren did incorrectly. He never “changed” anything. Everything that happened was supposed to happen, regardless of his want. He didn’t make a single thing in the past different than he already experienced it. One change could literally result in him never getting the power to make changes to begin with. The story was subtle, but then we were practically beat over the head with the why in the end and so many people can’t seem put 2 & 2 together.