Of course, various studies have shown that in trade between countries with highly restrictive import rules and high tariffs and countries with limited import rules and tariffs, it is the latter which fair better economically
The studies are kind of flawed (to say the least) when looked at through the lens of reality. Look at the US. NAFTA was signed in 1994, so that's a good place to start, Since then, major parts of the economy hollowed out, and China is poised to pass the US as the #1 world economy. China, of course, has more trade restrictions. So imposing trade restrictions seems to have worked quite well for them.
In 1994, the United States' national debt was $4.692 trillion. It's expected to be $18.713 trillion this year. In 1994, the US trade deficit was $151 billion. Last year, it was $661 billion. So in 20 years, the deficit has ballooned by almost 4x the total amount for the previous 200 years.
Worse is that in 1994, US imports only exceeded that year's exports by 30%. Today, it's 50%. It's quite simply getting worse no matter how you look at it. And then we can also point to the decline of the middle class, not because they've benefited, but because they've joined the ranks of the poor.
So, how's that free trade working for you again?