With an obviously unfair trade agreement that has facilitated numerous well documented frauds and abuses, the obligation rests with those who claim that staying

With an obviously unfair trade agreement that has facilitated numerous well documented frauds and abuses, the obligation rests with those who claim that staying is beneficial to provide evidence to that effect. The only downside you have mentioned explicitly is that "US customers may pay more for shipping" is clearly false. The money for that subsidy has to come from somewhere and it has been coming from US customers paying more for domestic shipping.