I do not trust economists on this issue. Many doctors and even prestigious academics and journals are openly admitting that aspects of medicine have been compromised by the processed food industry and pharmaceutical industry. I posit that economics has been even more compromised by multinational corporations and financial entities, but economics is such an insular "science" that they've just built their ivory tower up higher to hide more and more bullshit.
The main benefit that they give for Americans is that everything became cheaper. We can buy cheaper phones, appliances, cars, clothing, and household goods. But that's exactly what most of these things are - cheaper. We're importing a vast quantity of crappy junk, exporting untold pollution and human suffering onto factory workers and laborers in China, and hollowing out the American middle class in the process.
When presented with evidence about the declining quality and huge externalities of imported goods, they hand-wave about rational actors and price discovery and how consumers will just select for the products that minimize heavy metal pollution in some far off mine in rural China. There's similar hand-waving about how Americans will simply find new jobs when all the factories in Ohio automate or close. When products die more frequently because they're not engineered for durability or serviceability, they hand wave again about how consumers are making informed decisions to maximize their utility at the time of purchase.
The truth is a lot of this was a great con with a thin veneer of respectable economics on it. A few of the economists were in on the con, but most of them were taken for a ride. There were a few warning us all along about market failures, wealth inequality, disruption of rapid globalization, and unchecked externalities, but most just wanted in on the money.