Drake equation always bothered me when used in argument of contact probability, because it doesn't take into account time. Yes, there might have been billions o

Drake equation always bothered me when used in argument of contact probability, because it doesn't take into account time. Yes, there might have been billions of extraterrestrial civilizations, but that doesn't mean there are currently ones that 1) already can communicate or receive EM waves, and 2) not yet deprecated use of EM waves. Oh and there's also speed of light issue.