I don't think it is necessary to concern oneself with these issues of quantum theory, parallel or holographic universes, time travel, and multiple dimensions. It is wonderful and very interesting that Everett's theory was recently supported by mathematical proof, and I find such things immensely interesting. It may also help us accept the concept of reincarnation, which was once considered impossible.
But, unless one is winning money by playing the odds in a card game or roulette table, we are still dealing with Newtonian Physics in the context of what our senses tell us in this present dimension. Right now, all we seem capable of doing is living in this life, no matter how confusing it seems. And, it's reasonable to believe that we can't go back to prevent the assassination of Archduke Ferdinand.
Of course, there would be nothing better than having a time machine in our basement that would provide us with the opportunity to change or correct something in the past. Have any of us considered what would happen if everyone had such a device? We would find ourselves living in an incomprehensible world. Even though such things as holographic parallel universes do exist, as supposedly proven by a group of Oxford scientists. It won't change anything in our present semi-comprehensive existence.
That cookie we had last night may still be the reason why we gained just a little more weight. And, our car will still have a blowout on the way to our own wedding ceremony, which means that poor Henry won't be born, and the Third World Was was avoided.
With this new discovery we can accept one scientific theory as well as any opposing theory without being in conflict with ourselves or with each other. We can also accept that reincarnation is possible in a world where everything seems governed by cause and effect. Although we can't jump from one reality onto another into the past, like Tarzan from vine to vine; we MAY be able to come back to correct the mistakes of our previous life through Karma and reincarnation.
Just my 2.21475 cents.