...aaaand lots of possibilities to ruin your world.

Don't kid yourself, they're called "devcommands" for a reason. Use them at your discretion, but be warned that you can brick your world.

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I wonder why people don't understand that allowing players to switch worlds, and not allowing them to transport ore through portals isn't a contradiction.

Players are supposed to play their character on one world to completion. They are not allowed to transport ore to facilitate exploration, especially by boat, as vikings were avid and accomplished sailors.

That said, they also made it a convenience thing to allow your character after that to visit other worlds, so they can explore them at their leisure. They're still not allowed to move ore by portals, but you can move ore over from your OLD world, if you so desire.

And again, there's the old adage, that just because you CAN do something, doesn't mean that you SHOULD.

There is something called self restraint ;)

Edit: Words are hard.