Well, if we're being that literal, it's impossible to sink entirely in real-life quicksand, too. You can only be submerged up to about your chest, because you are less dense than the quicksand itself.I thought so too, but lava, even if it WERE safe to stand on irl, is FAR too dense to sink in.
Now, that's a legitimate complaint. But I didn't mean to imply that it would be better, either.That, and it doesn't seem like that great of a mechanic (it certainly didn't in the multiplayer level with it...). It sounds more like a giant annoyance than anything else.
Maybe we shouldn't overthink this stuff. I mean, this is a game with an anthropomorphic talking hedgehog. We don't need to be 100% accurate to science.