Milk is a good example of how the EU affects us.   One of the reasons milk is so cheap now is that the EU has banned exports to Russia because of its support for Ukraine.  EU countries used to export a lot of milk, they now have to dump it largely in the EU, hence oversupply, reduced prices and farmers going bust.

As in independent country we could decide these things for ourselves knowing what the impact would be on our home market before we decided to make a change instead of having unelected officials in another country make decisions for us.