I'm currently working my way through The Alchemist Who Survived Now Dreams Of A Quiet City Life, and I'm trying to figure out the morality of a certain common plot point.
Finished The Alchemist Who Survived, and as it turned out, the protagonist buying a slave was indeed another example of the writer wanting the protagonist to have another character who was utterly devoted to them, without doing the hard work of showing how this devotion might have come about "naturally". Outside of the slave's flashbacks, the concept of slavery is left as some abstract thing that exists in the world, but does not actually affect much about it that wouldn't have been solved by regular hirelings.
It's a lazy copout. Which makes it even more of a shame, because the overall story is mainly about how the protagonist is trying to adapt to the world, since she had spent two hundred years in suspended animation, and so there's the occasional melancholy of remembering the world as it was and seeing what it has become, sprinkled with the clear PTSD of being a survivor of a monster horde stampede that
flattened a city (and caused the protagonist to go into suspended animation in the first place). So there is plenty of narrative space for the protagonist to be able to gain the devotion of the clear primary love interest through her actions and personality, without having to go through this slavery business at all.
And while the beginning of the story has the justification for the slave contract to be a way for the protagonist to have someone she can trust, as it turns out,
every significant character the protagonist meets is someone she can trust. So it's not a cynical world of "everyone will backstab you", but rather a optimistic world of "everyone is good at heart". Which makes the slave contract
even more pointless.
I suspect a large part of why I think lazy writing is to blame is because there are a
lot of descriptions of "alchemy", using fictional ingredients and fictional processes, like the author was more proud of their alchemy system which they came up with in a vacuum, and decided to write a story around it. And for some reason, the alchemy uses SI (or SI-derived) units for measurements, like Celsius.
Overall, The Alchemist Who Survived is a story that is one half an intriguing premise of a character displaced in time, and one half
complete BS that could have been trimmed down or excised completely.