Well, I think you have it, here. I reconcile 'making it up' with 'having the details' the same way Phil did. He was very up-front about the fact that nobody, even himself, knew everything that there was to know about Tekumel and that he 'made stuff up' as needed in the course of the game campaign. As he put it "I can't think of everything!" and he was right up front that he very often would include something into his world setting when somebody asked him a question about that subject. For example, we didn't know a lot about the Nyemesel Isles until we went there; Phil used us a lot to explore his world, so that he could incorporate that information into his novels and texts.
Phil sad, over and over and over, that taking the world-setting that he had created and published and giving it to one for their use was what the game was all about. He assumed, from the beginning, that people would diverge from his timelines and story arcs; he also encouraged them to tell him about these digressions, as he loved to hear stories about his world just as much as the next fellow. If he thought that the diversion was any good, or of any use, he'd introduce it into his campaign and we'd have to deal with it. (See also Lord Gamalu, from upstate New York.)
Where Phil got very cranky was when people abused this, sending him unsolicited materials that they insisted that he include in 'Official' Tekumel - and then getting very upset when he'd say no or offer some advice on their work. (Gary had the same problem, over the years, and developed a stock reply.) People would tell Phil, to his face, why he was not doing Tekumel right, and why their material would fix it for him.
This syndrome got especially bad in the middle 1990s, when 'canon' became the buzzword. To the 'canonistas', doing anything aside from what The Great God said in The Sacred Scrolls is a violation of The One True Faith. I don't understand these folks, frankly; there's what Phil did, there's what I do, there's what you do. It's all equally valid. Unless, of course, you're trying to be the TSR of the late 1980s and into the 1990s.
Do I make stuff up? Yes, and so did Phil. (And so did Gary and Dave.) What we do is then write the stuff down, so we have it for later. Do that for forty years, and you get a lot of data built up. As Phil said, use as much or as little of that as you want - it's your campaign.
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