Full size type B is not the only type B that exists. Micro-B also exists, which is a way more popular form of USB B.

As I said in the comment. You couldn’t direct the pigs back then. There weren’t carrots in a stick. There weren’t even carrots. Saddles are very old items.

At the start, horses didn’t exist. But saddles did. Why? Because pigs can use saddles too. You couldn’t even direct them, you’d just be on top of them while they wandered on their own.

Saddles weren’t a tool, they were just a fun useless toy. Which makes sense you couldn’t craft them. It was just a silly reward for finding a dungeon.

Then they introduced horses, which used the same saddles, but forgot why they weren’t craftable in the first place.

EDIT: they did have a use. It was for the achievement of falling to death from a pig. Which makes it make extra-sense it being uncraftable. That is, until they introduced horses.