> the shape of cucumbers..
I know that this is often used as an example of how ridiculous the EU is, but if you think about it, actually isn't. You need rules and standardization to be able to trade effectively.
If everyone is happy and close by, trade is simple. But as soon as there's conflict, it becomes messy, especially if the trade is international, and spread over time.
Let's say I order a few containers of cucumbers from you. A couple of months later they arrive, I open the containers and inspect the cucumbers, but find out that they're wrong. The colour is wrong, or the shape is wrong, or it's the wrong cucumber species. I complain and say that I can't sell these in my country, consumers wouldn't want to buy them, but you just say that in your country you call these things cucumbers, and customers would happily buy them.
I paid for cucumbers, you shipped cucumbers, but our respective definition of cucumbers are not the same, so now we have an international trade conflict.
And that's exactly what the "ridiculous" EU trade rules solve. They set up common shared definitions of stuff that gets traded so that everyone agrees what a cucumber is, and so that the above scenario doesn't happen. So you have to write down the accepted curvature and greenish hue a cucumbers has to have to be called a cucumber, even if you think it's ridiculous.