I’m not interested in a technobabble explanation for how communications work, or even ways to reconcile what happens in Rogue One with what happened in the OT. I think the essential point is that the ease of access the rebels had to long distance real-time communications felt instinctively un-star warsy to me. It doesn’t automatically make Rogue One a bad film, and is actually quite fitting for the ‘War Movie’ vibe they were trying to achieve.
I agree with you, I had the same feeling.
Maybe it’s just this generation that needs to be in real-time communication all the time carried into the movie compared to the time the OT was made where you were on your own in vast space.