Listen, Hemalurgy is incredibly morally dubious. I do not condone any irl hemalurgic practices.
However, you do have to admit, it is pretty freaking cool. I disagree with the morals, but agree with the worldbuilding.
I love it as a plot point, a way to theorize and learn, I love how you could pass down powers to future generations, or kill everyone in the cosmere with a single aluminum spike (look it up, their overpowered).
Hemalrugy is the worst MoI of the Cosmere. But, it is the coolest (Besides Feruchemy) MoI in the cosmere.