Raven Crowking said:
In other words, if you change the fact that falling hurts, you are plaing in a different world, but if you change the degree to which falling hurts, you are not? At what point in the spectrum between "falling 10 ft instantly kills you" and "falling 100 ft causes minimal (1 hp) damage" have you switched worlds? And, if you haven't switched at all, why does removing the damage of that 1 hp (i.e., moving to no damage) make such a difference compared to the oodles of other damage already removed from the system?
This is how I think of it.
You have three models.
1. Is a model of 9 planets and an asteroid belt moving around a star. The orbits are circular and the planets are evenly spaced apart. One planet has a ring system. None of the planets have moons.
2. Is a model of 9 plantes and an asteroid belt moving around a start. The orbits are elpitical, and the model is much larger, with the planets not evenly spaced apart and the planets beyond the asteroid beld are a great deal further away from the star than the ones inside the asteroid belt. Some of the planets have moons. The largest one, for example, has for moons orbiting it.
3. Is a model of 5 planets and two asteroid belts. This model is the same scale as modle two, but all the planets resemble the planets inside the asteroid belt in model 2. Some of the planets have moons.
Now, models 1 & 2 are models of our solar system. They both model the same physical object, but they do so it diffrent ways. In other words, though they model the same thing, they are diffrent from each other. Model 3 doesn't model our solar system, but it does model a solar system. Each model serves a diffrent purpose. 1 conveys the rudamentry properties of our solar system, 9 planets orbiting a start. 2 is more acurate in the portrial of the orbits, and is closer to the porportion of solar system, being made to scale. Or close to scale. 3 folows the format we think of when when we think of a solar system, but otherwise is missing to many familer things for people to really buy it as a model or our solar system.
It's the same thing with games. I can model Star*Drive with the d20 future rules, or I can use the Alternity ruleset, but I'm still modeling the same setting. If I were to remove a key feature of the setting, like faster-than-light travel, I can continue to use either ruleset even though I would no longer be playing in the Star*Drive campaign setting.
To more directly answer you question. Removing that 1 point of hp is a mental barrior. It's one thing for falling to cause little damage, it's another for it to cause no dammage at all. The diffrence between 0 and 1 is quite a bit when you really think about it.