On the other hand, I second that "slave" is not a good terminology and trivializes real slavery, while a lot of words like "replica" or "worker" are more descriptive in a software context.
I tend to agree that master has a sufficient breadth of meanings that you often can't/shouldn't eliminate its use.
From the Wiki article [0]: "In medieval wars many Slavs were captured and enslaved, which led to the word slav becoming synonym to "enslaved person
https://en.wikipedia.org/wiki/Slavs_(ethnonym)
For the same reasons people argue against abusing terminology like "retard" or "gay", you could argue that using the word "slave" affects people's perception of Eastern Europeans.