I disagree as well, which is why I used the phrase "it would seem". Yes, Close Encounters used light and audio, and ET managed to get his message across with only a few words of English. Yet look at some of the stuff on TV recently: Stargate, Lexx, Andromeda, Star Hunter, etc. They all speak english to each other. I haven't followed those particular shows much because, to be honest, I don't find them to be all that good, so I don't know if they have some explanation for why they can all talk and understand each other.
Mind you, it would be difficult to have an entertaining weekly show without having the characters speak the same language, but the reason they can speak the same language needs to be explained.
The other part of this, and what I'm more intrigued by, is: can entertaining science fiction be produced without resorting to some construct to allow the characters to all speak the same language. Your example of Spielberg shows it can be done, and quite well, as does the original ARENA story I mentioned above.