It really is just living in dream world - the EU will likely remain our biggest trade partner as our closest neighbor and current largest purchaser of our goods and services. Brexit won’t magically make that stop, particularly if we aren’t wanting to have the economy totally unravel beneath our feet. It’ll only serve to make trade much more complicated and costly in regards to trade with the EU.
Furthermore, without us in the EU, we are in a far weaker position to negotiate trade agreements. Leaving the EU makes us smaller on the world stage. A smaller and less important trade partner. And likely a huge hit to our soft diplomatic power.
You’re right in that control over our borders is the most significant thing that could come from Brexit. And for us to retain any of our EU benefits that so many on the Brexit camp say that we’ll be able to have despite wanting a hard Brexit, we will have to cede some of that control over our borders. The best case Brexit scenario imo is we go the Norway route... and even then, I don’t see what the point is as we would still be beholden to EU regulations. We just would no longer have any say in what those regulations are.
The illusion of freedom isn’t worth creating economic instability and putting the personal wealth of all British people at risk, decreasing Britain’s soft power, and ability to negotiate trade deals.
The biggest beneficiaries are disaster capitalists banking on economic collapse and privitisation. They’ll have ultimate freedom. But not the vast majority of people.