I said it's a bad idea economically, and I stand by that
That's exactly what it is.
Milton Friedman, and others, demonstrated long ago that tariffs hurt both sides economically. If your trade partners can produce goods more cheaply, you're better off letting them, from a purely economic perspective. But what you're actually describing is not an economic advantage, but protecting manufacturing capability, which is a separate issue.
Friendman was a smart guy, and the concept of not having tariffs is a good one in general. In terms of it's good to the economy, there should be a statue of him in Tiananmen Square, right by the memorial to Mao. No sarcasm, I can't think of an American who did more to improve their economy.
An accountant can only create theories and models based on the system at hand based on their understanding on it. The very best they can do is construct a model that appears to align with the facts at hand, and then prove correlation of their model and the actual data. But that doesn't mean that they've proven that they truly understand the root cause OR that the model has any validity outside the current datasets. It's easy for someone familiar with numbers who is good with math to confuse familiarity and observation with understanding. We had an accountant that thought he could run a war in SE Asia better than the generals could. He was incorrect. We have Friedman who honestly believed he could've made the great depression better, if he were there, based on money supply theory. The arrogance of some of these folks is off the scale.
An accountant can walk into a business, cut the R&D, cut the maintenance budget, fire some of the senior leads in the tech areas, stop buying new equipment, and boost the profit of a company for 6 months, 12 months, maybe longer. Implementing a system that slowly destroys a countries manufacturing base will eventually cripple it economically, in part because you'll forever force it to import manufactured goods. Their are only a handful of things that prop up any economy, and they include manufacturing, agriculture and export of natural resources, and labor.
Carrying the "outsource everything" model to the end point, you're left with 2 people sitting at desks, while everything the company, or country, does is done by other people. They just own the capital. At some point the other players look at each other, then to the two people at the desks, and wonder "why do we need those 2 guys", and then they're gone. We're getting close to that now. Or in other words, it's OK to listen to the clairvoyants if you want, but don't let them steer the ship.