>entire thread of autistics debating the pros and cons of real world slavery instead of answering OPs actual question

>Why is it that whenever slavery in isekai is debated, the OP can do anything protagonist is suddenly powerless against systems?

Because its part of the authors fetish. Thats why. And you dont put your fetish into the story just to have the protagonist defeat it and make it no longer relevant to the story.

Slavery in settings where it is within the protagonists power to end it but he is magically powerless to do so is pure "magical realm" slop