Lanefan
Victoria Rules
I'm not most people then, as to me the very fact that giants can't function under real-world physics means they need the environmental presence of magic in order to exist/survive. "Giant" versions of some smaller mundane creatures, e.g. a giant rat, could function under real-world physics and thus would survive were magic to disappear from the setting. (I've had to think about this due to the countless times I've had to rule on what counts as a "normal animal" for purposes of spells that affect such)I see. So is the question really is whether there is some middle space between 'magic' and 'normal as in the real world?' I'd say there is, for example most people wouldn't probably see giant creatures as magic, even though they couldn't really function under the real world physics.
Same with a high-level fighter - she's able to do what she does only because of the environmental presence of magic. In a non-magical world she'd still have skill but only that of a good real-world swordswoman, not the quasi-superhero she can be in a magic-friendly setting.