This might have been mentioned already, but light travels quite slowly through the galaxy. It would take 200 years for any data signal transmission from an exploration ship to reach Sol from the edge of inhabited space. It would take 25,000 years for that same information to reach Sol from Sag A*.
Clearly we have FTL communications since we can chat to people and get their data updates via Wings. So that's not a logical in-game reasoning. Not to mention you'd never have anyone ever rescued even one star system out of populated space if you had to rely on light-speed communication.
I think my favorite in-game reasoning has to do with the bureaucracy and confirmation that the data is genuine back at a station. That makes in-game sense.
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