Howling:Gallifreyan timeline in relation to the rest of the universe

Okay, we've seen in the New Series how lots of people from lots of different time zones know about the Time War and the destruction of Gallifrey (e.g. Mr Finch in "School Reunion", the vampires in "Vampires of Venice", etc). So can anyone think of a rationale as to why this never happens in the Classic Series? The Time War was fought throughout time and space, so it stands to reason that people would know about it back then, before the Doctor and the Time Lords themselves had experienced it in their personal timelines. In fact, everyone in Classic Who acts as though Gallifrey is still very much an active intergalactic superpower, not an ancient myth. Good examples of this include "The Brain of Morbius" (Solon is from Earth, placing the events of this story sometime in our distant future), "The Invasion of Time", "The Two Doctors", and "The Trial of a Time Lord."