(denuclearization would be an unqualified good thing)
Trump seems to have backed himself into a corner by claiming yesterday that North Korea had also agreed to things not specifically laid out in the deal because, hey, they had a plane to catch and they ran out of time to add it. If we now come back and say "we didn't agree to that," how does that look?
Ultimately, this meeting was good because it keeps Trump happy and placated while the real negotiations between Kim and Moon proceed.