What, you mean green exploding wangs, countless undead, spiders bigger then a grown man, taking 8 cubic meters of gold and putting it into a apple(which then becomes able to cure any wound, save death), weird dust which can power damn near anything, interdimensional travel, giant flying jellyfish which shoot fireballs at you, rocks which emit as much light as the sun, slenderman knockoffs which can teleport, and the ability to carry 2304 cubic meters of stuff without a backback isn't "Magic" enough for you?
Face the facts: Minecraft is a Fantasy genre game, even if it IS a sandbox. Magic comes with the genre, and is often omni-present.
...Though yeah, Coal has MUCH better uses then simply burning it. I had a double chest full of it on one world.
I don't see mobs as magic (though i have a hard time with endermen and skeletons) i just see them as a badly skinned version of the real life equivalent. (Mind you, i only go to the nether for lightstone dust and ONLY that, i hate the nether)
Zombies = My mom when i wake her up in the morning.
Creepers = I live in the concrete jungle, i see them everywhere... They just don't go *sssssSSSSSSSS* yet and explode on me.
Spiders = Something really bad was released into the environment and made then grow extremely large and very angry at night because they suffer from insomnia.
They could all just as well be...
Zombies -> Angry mobs.
Creepers -> Jihadists
Spiders -> Spiders, just smaller and very hostile at that and nearly impossible to kill with a sword... Bring a flame thrower!
As for carrying capacity... That is really all about GAME BALANCE. A lot of people claim the game "Armed Assault 2" is the most realistic game of all time. Yet, a soldier carrying a M240 machine gun and a AT4 launcher as well as more ammo than 2 people normally would can run over 4 kilometers in the same time as someone who wears nothing but his undies.
We can carry that much because how fun would it be if we had to drag stuff out of our mineshafts a few rocks at a time? We dig mineshafts that hold MILLIONS of tonnes of rock in 1 hour. Say we dug out 5 million metric tons. out of a 50x2 meter long tunnel. we would have to make 200 trips back and forth just to empty the ROCKS out of that tunnel. We would probably find a few nuggest of gold and iron. After having spent more than 200 hours hauling rock...
FUN?
You see, there is a clear distinct line between what is game balance for FUN and magic lalala stuff that only little girls who watch sparkling vampires should like.