Sure he might want to do that, but I think his behavior shows he's still beholden to the markets to a large degree. A lot of his (self?) image is tied into 'economic performance', rightly or wrongly.
And he seems to be trying to crash it each spring (Tariffs, Iran).. looking forward to next season.
The market is not stupid enough to ignore what he does after hours, it just blunts the knee jerk reaction by a few hours.