In the past, countries would put tariffs on importing cars, but not on importing car parts (with some complex definition of what constitutes a car and a car part. IIRC, there once was a loophole where one imported a car and converted it into a van by removing back seats to avoid a tax on importing vans)

Nobody is building a new factory, based on tariffs that they expect to be gone in three years time.

For many industries it might not make sense unless it's a 5-10 years long plan, the risk of investing a lot to build a new factory, bringing it online over the next 2-3 years, to then have tariffs removed and making your new shiny factory more expensive to run than one outside of the country, will also be factored into the total cost.

The tariffs are so broadly applied that the risk factor is much more massive than anything the USA experienced before (like during the Japanese cars era of the 70s/80s), it's wishful thinking the domino effect will happen in the short/medium-term.