“Controlling which Everett branch you end up in” is the wrong way to think about decisions, even if many-worlds is true. Brains don’t appear to rely much on quantum randomness, so if you make a certain decision, that probably means that the overwhelming majority of identical copies of you make the same decision. You aren’t controlling which copy you are; you’re controlling what all of the copies do. And even if quantum randomness does end of mattering in decisions, so that a non-trivial proportion of copies of you make different decisions from each other, then you would still presumably want a high proportion of them to make good decisions; you can do your part to bring that about by making good decisions yourself.
Going along with this, our world doesn’t appear to be the result of each individual making “random” choices in this way. If every good decision was accompanied by an alternate world with the corresponding bad decision, you’d expect to see people do very unexpected things all the time. e.g., this model predicts that each time I stop at a red light, there is some alternate me that just blows right through it. Why aren’t there way more car crashes if this is how it works?
“Controlling which Everett branch you end up in” is the wrong way to think about decisions, even if many-worlds is true. Brains don’t appear to rely much on quantum randomness, so if you make a certain decision, that probably means that the overwhelming majority of identical copies of you make the same decision. You aren’t controlling which copy you are; you’re controlling what all of the copies do. And even if quantum randomness does end of mattering in decisions, so that a non-trivial proportion of copies of you make different decisions from each other, then you would still presumably want a high proportion of them to make good decisions; you can do your part to bring that about by making good decisions yourself.
Going along with this, our world doesn’t appear to be the result of each individual making “random” choices in this way. If every good decision was accompanied by an alternate world with the corresponding bad decision, you’d expect to see people do very unexpected things all the time. e.g., this model predicts that each time I stop at a red light, there is some alternate me that just blows right through it. Why aren’t there way more car crashes if this is how it works?
Worlds can differ in measure, although no one is quite sure what that means.