It's less that the galaxy is quite that's disturbing, as like you said it's possible EM based communication is only used for a relatively short amount t of time

It's less that the galaxy is quite that's disturbing, as like you said it's possible EM based communication is only used for a relatively short amount t of time. The fact that the universe seems to be totally natural, without any intelligent interference is more concerning. No megastructures or evidence that our solar system has been visited.