I've used tap water with saltwater tanks that were just fine. However, in my current reef I like to have a little bit more control over what actually goes into the tank because I'm a control freak like that. Using RO/DI helps to give me that control. Again, tap water is fine if you don't really care what goes into your tank. TDS of anything above 0 means there's stuff in there. What that "stuff" happens to be is anybody's guess. Will that stuff hurt your tank? Probably not, but it's a variable that is unknown. A lot of people use tap water with their reefs, this isn't anything revolutionary or revealing :-)
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