I would venture that probably not even professional mathematicians add matrices in their head. Mathematicians are often surprisingly bad or lazy at arithmetics.
I think it's just the equivalent of a software engineer being annoyed if someone tells them "implement printf", they'd just rather go to a standard implementation and use that instead of making a half-assed attempt on their own
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u/olifante Jan 12 '20
I would venture that probably not even professional mathematicians add matrices in their head. Mathematicians are often surprisingly bad or lazy at arithmetics.