Quoted from seenev:
Matrix 4 is so bad that they explain Neo and Trinity being alive by just saying the machines rebuilt their bodies, and then NPH actually says that the process was really expensive... Like the machines have some kind of financial economy and they're worried about how much they're spending on resurrecting humans. I can't get over how badly written this movie is. Keanu is too nice. He needs to learn to say no to his friends.
NPH explains how they have to keep Neo away from Trinity and then Neo's handler deliberately introduces them to each other.