Disowning current tariffs doesn’t mean they’ll go away, either, though.
Tariffs are easy to put in place, but hard to roll back. You can put then in place on a whim, basically, but then the target country will retaliate with their own. As a result, removing them requires diplomatic negotiation to make sure the removal is bilateral. That’s not easy to do during times of icy relations like China and we currently have.
I switched to Thunderbird when they started to get insistent about switching to Outlook.