When did it all go wrong for the macroeconomics field?

It's philosophy, and it was relatively poignant philosophy up until the turn of the century.

Lol what. Most people who try for an econ PhD double major in math and econ or just did econ as a minor and majored in math. They then take graduate math and stat classes in any good program econ program, and this is assuming they aren't in a really econometrics type niche.

Engineers take a fourth of the math classes.

this
I studied both, the most math I did for engineering was calc3 which wasn't that bad
I saw the graduate level econ math and it scared me