Agreed. I always try to think of these kinds of questions in two ways.

The first way is from a hard sci-fi perspective, like how can this become a believable thing. How can we change as little as possible in the universe to make this a real and normal thing, so we can expect a reader to have enough suspend of disbelief to serve as a good backdrop to a story. This way it's fun to think about these things and see how we can still be living in the real world, but with something cool added. Instead of going full "it's just magic" and thus cutting out any thought proces.

The second way is from a real life standpoint. Like if we extrapolate our technology into the future, but keep in mind real life limitations, laws of physics etc. So no over unity, no FTL, nothing that would require the power of a star to work but also somehow not be an actual star etc.

So that's how you can easily get to two kinds of answers from a singular question. And it's all speculation anyways, just a bit of fun.