bogi_khaosa said:
Moreover, interstellar communication requires astropaths. Astropaths are very rare, and using their powers tends to kill them after a while, as well as opening the doors to the Warp. Which is bad. Therefore, they are going to be used as rarely as possible, only to broadcast those messages that the powers that be think are extremely important. They are not going to be used to tell the galaxy about Malfi's hot new singing sensation. Malfi's hot new singing sensation will live and die in Malfi, totally unknown to everybody else in the sector.
Although that might be reasonable, this kind of situation (i.e. lack of communication) will make Imperium even more antiscientific.
Not to mention that according to the "official fluff" like Gaunt, Eisenhorn, 13th Legion , etc. that kind of communication is not that rare as you describe.