Heard an interesting take on the fast food feast thing. Basically, it's STILL Trump trying to appeal to his base, who would view such fare as "highly American" and delicious, as opposed to whatever fancy feast the White House chef would prepare. So any complaints about the "fine china touching the nugget sauce" as it were are just demonstrating the class divide that Trump exploits. So complaining about Trump's ostentatious displays of consumption and wealth is pointless because the part of America he's playing to loves ostentatious displays of wealth and consumption... and hates the people who don't.
In that light, the point of the move is obvious in retrospect. It's still worthless and grotesque, but not without reason. He's trying to become the living embodiment of the Ugly American, so they'll side with him if things get ugly.