"where did you get this idea?"
From actual physics classes I took as an undergraduate. including *most* of prereqs for a physics major. But there weren't enough hours in the day to double-major physics *and* math at Princeton, ... and also algebraic topology was more fun, so I went with math.
And I get that undergraduate courses in many ways barely scratch the surface (my astro course *was* strictly intro: we did track-I of MTW) of what practitioners Actually Do. And I also get that it can take a while for the bleeding-edge stuff to trickle down,
... but they did try:
1/n