Typically take-home tests in any SWE field don't account for everything as it's a layer of screening: that's what an on-site is for (even better: adjust the on-site to address the results of the take-home).
I completely agree, and that's exactly my point: the median data science screening process tries to be all-encompassing to an extent that would seem ridiculous (for a "take-home" assessment) in any other technical field.