Reddit reviews Why I Left Harry's All-Night Hamburgers

Sci-Fi show creators almost always say they want to avoid time travel: it very quickly and easily becomes a crutch which also causes the audience to lose attachment to the storyline. This is why time travel was used sparingly, but also in very intricately connected ways in Futurama.

In Doctor Who the constant time travel is so abstracted that it becomes less "time travel" and more just "travel" to the viewer.

In 'The Terminator' time travel is one-way, you can't bring anything with you, and there's no going back.

In Back to the Future I'm reminded a lot of Why I Left Harry's All-Night Hamburgers which is that once you've traveled, you've altered the past, and there's no going back to your original timeline period; no matter how close it may seem, it's always just a little different.

But basically: I don't think Time Travel will become an intricate part of the plot as they already have a large travel mechanism with Interdimensional Travel (which is just like the dream states in Inception or Time Travel is Doctor Who: it's just a way to get from A to B instantly in a way tied to the story no matter how crazy).

Time travel would just complicate things for almost no reason.

On the Time Travel Stuff, just because Rick can't time travel doesn't mean information can't; if he has a way of communicating with the future/past, that might be the reason for the box and its "stuff."

If Rick could time travel, he'd very likely go back and "make things right" with his wife and Beth.