This is implicitly setting out a very specific set of criteria for where this location is and how it expects to be found, though, for that to be a risk at all.
- it has to be far enough away from the bubble (or other high-profile waypoint) that it gets visited approximately twice by random chance in the overall game lifetime
- it has to be close enough to that focus of travel that it's going to get visited at all
- the relative obscurity of the system is the only thing preventing the location being found (no permits, no license requirements, no weird conditions, no hiding it at an unmarked surface location, etc etc)
- conversely, there are no clues which might reasonably direct someone to look in that system or even that general area (or they'd conduct a more detailed search regardless of the presence of a few tags on some of the systems)
- it's something important enough to be more than of minor interest if discovered
- it's also something for which (see point 4) there's no requirement from Frontier's side for it to be discovered on any particular timescale or indeed at all
There are lots of locations far from the bubble that naturally attract explorers, so a seemingly random POI could have a reasonable chance of being found. Examples are:
- Cool Nebulae
- Furthest reachable locations (north, south, up, down, end of spiral arms, etc.) - obviously this changes with updates making ships jump further.
- Systems with semi-unique stellar features. Black holes, unique stars, things for completing Codex.
- Systems near Sagittarius A*
However most special locations have been already visited. And cmdrs tend not to spend 10 minutes to go visit planets on a secondary star in an already discovered system. Why would FDev place a special POI in a location like this?
- There were clues but they too obscure, bugged, or lost in subsequent updates.
- They miscalculated player behavior. They didn't realize discovered systems would get ignored, making a special POI lost forever.
- A bunch were scattered around with the thought at least one would be stumbled upon. Again... a miscalculation.
- A programmer was feeling silly and thought it would be fun. Who knows? Remember that FDev has implemented many partially complete, broken, and bugged features in the game.
Certainly anything critical to the current game story will get a big neon sign pointing towards it. So anything that has been essentially forgotten by FDev (or just don't care anymore) is probably not going to be a major revolutionary discovery.