True, individuals aren’t completely without influence of course, it would certainly re-roll details of what exactly happens, which could turn out significantly better. Unfortunately it could also be worse.

Also, there are limits to what can be achieved with it. For example, even without Hitler, to achieve a successful socialist movement in Weimar Germany, you’d have to do a lot more, Hitler was raised into a fascist demagogue by organizations active long before him, and their foundation was so rooted in the sense of revanchism and the rampant conspiracy theories drenching with antisemitism in Germany at that time, I genuinely think he was not important enough as a rallying figure to have tipped the scale, it was weighted heavily in their favour to begin with.

Keeping the SPD from hiring and strengthening the protofascist Freikorps alone would be more influential than killing Hitler, for example.