You can cheat to get cheats on after creating a world with cheats off. If you start a LAN and enable cheats, you can do all commands. This is like: "Oh no I fell in lava! But, that's not a problem, I just need to start a LAN and enable cheats, then I can fly out from the lava and everything is as normal.". And that's not supposed to happen, I think.

The cheats can be disabled if you rejoin the world.
You could do this since LAN was added.