Re: So, American Trade wars work?
There's a lot of strands to pull apart in your oversimplified statement.
There is overwhelming bipartisan support for large changes in China trade policy, and the Biden administration is fully on board with many, but not all, of the changes instituted under Trump.
An example of the "not" is dumping the idea of banning Tik Tok, which was just political grandstanding.
Even with bipartisian support, however, US absolute dependence on CCP imports for the basic necessities of keeping the economy running, and the threat that poses, is largely overlooked because the problem is too large to deal with, and there are too many vested interests opposed to solving it. Although there has been some movement under Biden to redevelop a chip foundry industry in the US - the long success of which is not yet known.
Banning exports is far easier - politicians just need to make a law or impose a policy and enforce it on exporters. But exactly like you say, the short term impact and the long term consequences may diverge greatly.
Whether any export policy is good or bad can only be properly evaluated by looking at the big picture and coordinating across multiple fronts - dependency on imports included, but also coordinating with other nations, etc. A distinction needs to be made between the visceral satisfaction of delivering a short term blow, and acting to ensure long term security.