From a "simulationist" perspective, you could see that rules are a model of a fictional world, just as the scientific laws as we describe them with mathematical formulas are a model of the real world.
The laws of science as scientists have formulated so far are not always a cohesive whole. One of the big dividers were (and are) the Relativity Theory and the Quantum Theory. The Relativity Theory described the "big stuff" - gravity on a large scale, the space time, and so on.
The Quantum Theory describes the "small stuff", atoms, electrons, quarks and so on.
These two theories fail to work at certain points, because they violate each other rules. The most important points are black holes (singularities) and the "Bing Bang". Because there the small scale of the quantum theory and the big scale of the relativity theory merge and both must be used to describe the process.
The string theory is an attempt to unify both, but as long as there are no experiments known that could falsify it, it doesn't really lead us anywhere. And as it stands now, it introduces a lot of "baggage", so to speak. You'd have to introduce new dimensions in addition to time and the 3 spatial dimensions, and you introduce concepts like that our perceived universe is merely a brane in an even larger universe.
There are other areas of science - for example material physics - where they use certain models that are not derived from the quantum mechanics of the individual atoms or molecules, but these models manage to give accurate predictions, and while attempts to use quantum mechanics to replicate the results are made (and possibly successful - i am not an expert on the matter), they require a lot of more work and computing power.
So, what's the point of this:
For scientific modeling of real world phenomena, you sometimes use different, inconsistent models. For calculating the expansion of the world, you rely on Einsteins Relativity Theory. For calculating what happens when a stream of photons hits on an excited nucleus, you use quantum theory.
In essence, you use what works and allows you to make reasonably precise predictions in a reasonable time frame.
And as such, the "narrativist" Minion concept can also be seen as using different models applied to the same universe.
A game world entity that can be described as a level 5 monster for level 5 character might be better described as a level 15 monster for level 15 characters. And it's not like the character itself is really level 5 or level 15. He is just something we describe with a level 5 or level 15 model, because its fictional world attributes match this model best.
Of course you can say: "But I want a better model - I want one where I don't have to change the representation based on scales or levels". That's what scientist want, too. But a mdoel that is more precise, more accurate, has the drawback of being more complicated and slower to use. All the computing power in the world might be required to calculate the movement of a human body if you wanted to describe it on the quantum theory level - and it would take them years to do so for a few steps. (I have no idea how long it would actually take

).
Sure, you might say that you wouldn't want to go that extreme, but you still like a higher degree of precision. That's valid. But understand (and accept) that for 4E, the designers decided this degree of precision was the degree that would give the best results for their target audience - Which might mean that you were not part of the target audience.
