There is no grand vision. Trump has an irrational love of tariffs. He just likes them, they feel right to him. It is entirely that we have a presidential system with an executive that is capable of too much unilateral action, and we elected someone to that office who is unfit for it.
When you are forbidden to expand taxation on the people with money, because "ideology" and your country is accruing debt at historic levels, tariffs are about the only revenue source that you have that won't make the oligarchs angry.
Does the admin’s affinity for tariffs have anything to do with Lutnick? His “former” firm bought tariff credits from companies for pennies on the dollar - huge upside if you knew what was coming.