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If "Master/Slave" terminology in computing sounds bad now, why not change it to "Dom/Sub"?
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
I think that's because in computer science most master/slave nomenclature comes from hardware with a command/control structure (still notable in things like Spark where the namenode/master node controls the data nodes).
GIT just took naming conventions from other existing design patterns (although I should probably look up sources to verify that assumption).