These things I'm saying apply to all campaigns.
About characters: It's even possible to add characters well after FREDding a campaign (providing that the missions feature messages coming from adaptable sources). Open the missions, edit the messages according to each character's behavior and repeat the procedure whenever it's necessary. It can be done via Notepad.
You can do that. It's a crappy approach, but it'll work. It ignores the need to show as well as tell. It indicates that the campaign's story in no way hinges on the characters. Retail Freespace never took that kind of slipshod approach: Admiral Bosch's journey was clearly worked in from fairly near the start.
Do you even need characters? Do you even need to base the plot on them every single time? I don't think so. Many people prefer plots that have nothing to do with RPGs.
All stories have characters. In Freespace 2 retail, the ships are the characters as much as the people. So are the head .anis and the automatic wingmen and Command messages.
And mythology? I've been changing several names for a while to give them a mythological meaning and I can ensure everyone that no particular skills are required to do that. All you need is getting to know the myths you're basing your concepts on.
That's not what mythology is.
Finally, if FREDding isn't good and originality is totally absent, good writing serves no purpose. I've read several writing attempts of people who came out with very good texts, but those texts were the result of a mere copy and paste of something else. Writing good stuff isn't enough: the stuff you're writing also needs to be original and, at least, plausible.
So what you're trying to say is, good writing has to be good?
I applaud your depth of thought.
All this said, I think you're just misinterpreting what writing means. I think you're thinking of 'craftsmanship'. Writing is something much more broad and much more necessary, and it must be the foundation of any campaign. A bog-standard retail campaign with merely passable gameplay can turn into a legend thanks to good writing...witness Derelict.
It's odd. Like I said, everyone thinks they can write, everyone thinks they know what writing is about. But you don't know any more about writing than I do about electrical engineering.
The fact that The_E got it so instantly and completely suggests to me we may have a language gap at work here. Take a moment to make sure you know what I'm talking about before hurling yourself at yet another windmill.