Scott Christian
Hero
I can agree, all those questions are valid. But they are all also irrelevant to my claim. The example wasn't extreme. I just gave a common example: One GM preps a lot and the other is all improv. Which one would have greater internal consistency over the course of a campaign? Common sense tells us the one who preps probably will.Are we assuming that the boatload of prep is specifically relevant to play? Lots of prep isn't really. There's also the question of actual deployment at the table. Is Laura a good GM? Can she keep all that prep straight and deploy it at the optimum time? Is Liam a masterful GM who's played this game and thus setting hundreds of times and thus the improv isn't quite so improv-y? Can you even name three games where the GM does no prep whatsoever?
As you can see, the list of rapid-fire questions approach is both annoying, and revealing. Your extreme examples are bit wonky I think. I'm guessing you went extreme for emphasis, but I don't think it's that helpful.
I have three main points here. One is that prep, regardless of magnitude is useless without a skilled GM, and no guarantee of internal consistency. Second, that an experienced GM, and here I mean specifically experienced with the kind of setting at hand, is perfectly capable of managing high internal consistency with minimal prep. Third, that unless we unpack what you mean by prep we are missing some key information.
I agree that prep of magnitude X, generally, and in the hands of a capable GM, will lead to more consistency within the confines of that prep. If it's the right prep, it might even help when the players inevitably step off-piste. But's that's as far as it goes.
An exploration of what you mean when you say prep should prove interesting and fruitful (as there's a lot of different nuts in that particular bag).
Are there outliers? Sure. Does it matter if one is a great GM and the other is terrible? Yes. I specifically said that when I gave the analogy of teaching and time management. Some people just have "it."
As for prep, I have gone down this road before, and I know it really doesn't matter what I say. I can give my experiences as a player (I am lucky - all the campaigns I have played in have been great!), and explain how the GM prep made the world feel real and succinct. I can give you my experiences of using my campaign setting has way more internal consistency than games where I GM in a generic fantasy world. But it really doesn't matter. Things like: cosmology, religion, species, food, geography, economy, etc. can all come into play when playing an RPG. Comparing a person who has spent time working the connecting threads out for those things or someone just making stuff up (or letting players make stuff up) is always going to lead to me thinking the former will have greater internal consistency.
I also believe, and I admit, I might be wrong here, that the person that has built those threads might lean a bit better on the pacing scale. But again, on that claim, I admit I might be wrong.

