For me, time travel is just a maguffin, a shorthand that allows you to tell a particular story that you couldn't tell any other way. It doesn't have to be explained past "slingshot around the sun" or "the Orb of Time" or "red matter" for that matter.
It's like Mike Okuda's response when he was asked how the Heisenberg Compensators worked. "Very well, thank you" was all that was needed. Even the compensators themselves are an explanation or at least an acknowledgement of the uncertainty principle but they weren't a necessary part of any story they appeared in and could have just as easily been called the Fontana Compensators or the Jeffries Transporter Thing-a-ma-bobs and the story itself would have turned out the same. Don't let the details get in the way of the stories and characters.