But if you only have one cite in a paragraph someone will slap a [citation needed] on individual facts within the paragraph. There's no way in Wikipedia to differentiate between "This cite covers the entire paragraph" from "This cite covers this sentence" without leaving a comment in the code.
I would hope that someone adding {{fact}} tags will look at a citation at the end of the paragraph and see if it includes the information they are concerned about. If they don't, then it isn't hard to remove the fact tag.
Some way to show what information is covered by what citation would be excellent - any suggestions? The only things I can think of end up destroying the human readability of the source code (which is bad enough as it is).