Your confusion is appalling. You don't like the benefit to dairy farmers with the restructured deal, yes we still have the same trade, but environmental issuses, agricultural, labor protections, digital trade provisions, intellectual property protection, and a few more. So what's wrong with it?
The problem is nobody from Mexico the US or Canada are monitoring it. Trump eliminated the board that oversees the trade agreement. If your concern was the $240 million in dairy products why didn’t he sign TPP the Us would have gotten twice that. Canada did sign onto TPP because it more than compensated the loss of dairy to the US. But like I say trumps USMCA is just a piece of paper and no Oversight and Congress will refuse to sign on without oversight.
Can you imagine Trump pushing Unions in Mexico and he is doing everything he can to destroy US unions.
If you take the time to reseach TPP the US would have gotten more from Canada and Mexico and TPP has oversight to make sure nobodies cheating