Re: What happened to 'time travel at will'/slingshotting?
Why the fuck would you want the mechanics of successful time-travel to be widely known? It makes sense that the Federation would want to keep a lid on something that could be used to wipe it out before it ever began.
That's the problem with time travel. You can't really keep it a secret. The mechanics are based on the laws of nature in theTrek universe and because of that, will be eventually discovered by other races. Or enemy spies will manage to steal that information. It's like the atom bomb: once the genie is out of the bottle, you can't put it back in.
It also raises an interesting question. Why there hasn't been any more attempts to mess up with Federation's history? Those temporal agents must really have their work cut out for them. I would think that sort of stuff would be an everyday occurance.
"God runs electromagnetics by wave theory on Monday, Wednesday, and Friday,
and the Devil runs them by quantum theory on Tuesday, Thursday, and
-Sir William Bragg