[zoomablemind]

> ...why is that it's called "routine”

Well, apparently [0], in a 1947 document "Planning and Coding Problems for an Electronic Computing Instrument, Part 1" by H. Goldstine and J. von Neumann it is stated:

    "We call the coded sequence of a problem a routine"

[0]: https://retrocomputing.stackexchange.com/q/20335