I feel like ppl way extrapolate the slavery thing as presented in the Prequels. They assume that it’s the same thing as American slavery bc most of us have been primed to think that way.
In the films themselves, it’s obviously still inhumane and cruel to own someone, but Anakin wasn’t physically abused. It even portrays his relationship with his owner as somewhat comedic (which is… an odd creative choice, to say the least). It’s not even mentioned in the other two movies as a source of pain or trauma, only losing his mother.
It’s not meant to be any worse then Luke’s upbringing (he had it rough too, living on a harsh desert planet).
Which is why I’m of the belief that slavery shouldn’t have been invoked in the first place. He should’ve just been a moisture farmer, like Luke.
Part of the OT’s narrative is that Luke is just as likely to then to the dark side as Anakin was.
It’s not taking a circumstances view, but placing the responsibility of their fates entirely on their own choices.

Also, it doesn’t come across that deep. Just cheesy romantic dialogue. And while that can work, it doesn’t, in that instance.