The DOW isn’t disconnected from economics, it just appears that way. It supposedly is inversely related to the dollar, so when the dollar goes down, the DOW goes up.
Sure does look disconnected when Uncle Sugar prints out more money, or lowers interest rates.
Of course, for the same reason that when the dollar goes down a cheeseburger goes up. It takes seven dollars now to pay for the fast food lunch including tax that used to cost forty-five cents back in 1965. The current Dow adjusted for inflation is really no higher than it was decades ago.