It sounds like we're generally in agreement here. The broad concept of "opting in" is based on the education of the player. IF a player doesn't know what a Non-Human Signal Source is, they're gonna have to jump into one to find out, or else be told by someone else. Same could just as easily apply to systems invaded by Thargoids, or Anarchy systems, or whatever. As long as it's reasonably POSSIBLE for the player to know what they might be getting into, then it should be acceptable to put any kind of threat or reward or THING in there, so long as there is a way to anticipate it and avoid it (edit: or seek it out for that matter). We need to move past the idea that every system should be functionally the same just with different USSs. Which system you jump into should be just as consequential a decision as which USS you drop into.If the threat comes to you it needs to be scaled to almost any player likely to encounter it. But if the player travels to it the threat can be scaled up to impossible.
If the player drops into a USS they are opting in. If the player knowingly makes a jump to a known to be dangerous system the whole system can effectively be one big high threat level USS with hyperdictions on the way in & other challenges as some cor alien base is approached.
We have a galaxy filter for choosing civilisation, we have a warning mechanism for jumping into anarchies (where the seriousness of the warning is undermined by every empty system being classed as an anarchy government rather than 'none'). The tools are already in place.
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