Colonizing a star seems too crazy, like Looney Tunes crazy.
Why, more crazy than traveling space, lasers, flying a chunk of metal through the air, teleportation, phasing into different space? I am not saying literally anything goes, but where exactly do you draw the line of science fiction and why? Because Dyson Sphere is a thing in science fiction.
We can already travel in space. The Hyperspace thing is a necessary game mechanic to make the universe work, in a sense.
We already have lasers, we just haven't weaponized them.
Teleportation and "phase-space", I suppose we can't say 100% they don't exist in any phase whatsoever, and they're there for a game mechanic to show off the capabilities of high-tech anyways.
Dyson Spheres are about building a megastructure around a sun to harness its energy, not about colonization.
I cannot continue to exist near the surface of the sun as an intact human being. I would not even be fortunate enough to continue to exist as a liquid.
Not a single building material we have is a solid at the temperature of the surface of the sun. Most of them aren't even liquid. Tungsten is one exception as it's barely a liquid at that temperature, but that'd vaporize too if the sun was just a bit hotter, not even 100K hotter.
That's just heat, I'm not even going to mention the crushing surface gravity.
This post fills me with dread for humanity. Conveniently shuffling over stuff you can't explain such as hyperspace, teleportation, phase ships, again waved away as "game mechanic"
But when we come to colonizing suns with example as a Dyson sphere and living on the shell of it while using the core as an energy source, suddenly it's not realistic enough, suddenly "it's not possibly by todays materials and theories"
Apparently even standard sci-fi concepts are too daring for todays mind to include in a sci-fi game that isn't trying to be a simulator. Yeah, magic, random humor. Not like this hasn't been the attitude from humans upon hearing any new revolutionary tech of theories through out humanity. Planes, electricity, computers, phones, cars, practically all of the technology we have right now or even the idea that earth isn't flat was not "magic" tier at some point, yeah, I am sure people said "yeah, I totally foresee that in a thousand years or two, people will be able to explain and harness all of these things.
I agree with the initial suggestion that black holes be deadly. It isn't like you are springing a surprising trap on the players if falling into a black hole is deadly. Implying that you would be is very disingenuous.
The real danger here is to the AI which doesn't seem to be able to navigate already as-is. This could possibly corrected by just adding a behaviour to have AI fleets avoid the vicinity of black holes at all cost unless they were going in for a specific reason (to fight or resupply a base in orbit).
If that would be the case, there would be the possibility to lose pursuers by taking a risky trajectory in an event horizon. So some added gameplay and more work on the AI for the dev. Over all the idea sounds nice to have, but doesn't seem like it's highly important considering the implementation isn't exactly "free"