Goods flow toward wealth. When we were wealthy, goods flowed here. If goods are now flowing the opposite direction, I don't see how this could be seen as a good thing. For us anyway.
That makes no sense. Global trade is not a zero-sum game.
If we have no need of a particular good, we see no benefit by keeping it.
So say that goods only ever flow toward wealth is simply not true. It doesn't make any sense, either. Goods do, and will always, flow toward the US. We will always have a need to import goods. But we must balance those imports with exports, otherwise we will bleed wealth.
Wealth is not wealth if it just sits there. This is why economic isolationism (i.e. protectionism) is a bad thing. If we decide tomorrow that we have $15 trillion-billion in our government bank account, is it really wealth if we don't intend on using it? Of course not. Wealth is a representation of buying power, nothing more.
As a country, we cannot gain wealth without exporting. With respect to the United States, domestic trade (me buying a good from a strictly US company) is zero-sum. It neither creates nor destroys wealth, with respect to the United States. If our only trade with the outside world is imports, we are operating below the zero-sum.
Domestic trade does not create wealth for the country, it only bleeds it.
However, if we modify your statement to say "
finished goods flow toward wealth," it's a little closer to accurate, but it's still not an all-encompasing statement. But we're not talking about finished goods...we're talking about a raw material that does us no good sitting in warehouses or in the ground. Exports cannot be a bad thing.