Well, we've always been able to foreshadow canonical events and sprinkle in guest-stars from the various episodes. Heck, I've brought Gary Seven back three
times, and can seldom miss an opportunity to tease future events in STAR TREK history, just not as part of any sort of planned story arcs. The question is: would more central planning actually make any difference?
I'm not convinced that, say, The Rings of Time
would have been more entertaining if there had been six months of buildup to it in earlier TOS books. Or if I'd thrown in a couple of extra scenes setting up Christopher's next TOS book . . . .
As far as I know, nobody has ever complained that "City on the Edge of Forever" was not part of a larger story arc.