I don't want to be nitpicky, but I guess this is nitpicky. Technically netherrack and air are more common than stone. And unless you count nothingness as part of the world, the limit of the world is 20-30 million blocks, not sure exactly. Sorry this is a bit pedantic, but the whole internet is pedantic.
Super nitpicky comment: Hoglins drop porkchop also. There is also the adventure game mode. You can explode slimes if you place TNT under them then light the tnt. The Wither comes after the Enderdragon. Dessert biomes are made of sandstone also.
When I clicked this quiz on the spotlight, I was dreading seeing a comment of mine. Not as idiotic as I would have expected, but still quite dumb of me
30/60 million works anyway. Also it is infinite, the game terrain keeps generating beyond the world border, you just can't access it. You can still move the center of the world border using commands though, so you are able to get beyond 30 million in vanilla.
Adventure mode: I should add, main game modes. You can't select Adventure in the world creation menu.
Slimes: everyone knows that's not what I mean by green creatures that explode.
Wither: the Wither doesn't necessarily come after the Ender Dragon and beating the Wither doesn't show the credits.
Sandstone: you have to type "sand" to get "sandstone".