"Do I need to know {insert advanced math} to get a Data Science job?" [Rant]

These posts occur with some regularity, and {insert advanced math} is some esoteric subfield of math, and the question is asked without any application in mind.

I'd just like to say, as someone who has now made a career in DS, "no, you don't." Day-to-day, most of what you'll be doing is statistical modeling, using sklearn/statsmodels/R, not building your own models from scratch. Knowing enough math to know, eg, why a matrix is singular, and why that's a problem for …

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