Didnt know that about undeads ...
But after litteraly two seconds of googling i have found this:
https://forgottenrealms.fandom.com/wiki/BaelnornSo ... really not sure.

Not even sure if tadpole that negates every single other aspect of his undead nature counts as proper magical intervention.

I wasnt purposefuly talking about slavery ... but about cruelity.
I meaned to point out that while we see Astarion actions and prefferences as cruel, maybe even sadistic ... he may see them as something perfectly normal, and concider us to be weirdos for our kind and understanding acts.
And all i wanted to point out that while he is indeed narcistic asshole for many reasons ... this one in particular may (just maybe!) not be token of this part of his nature ... but only mark of that how much broken he is as a person from the way he "lived" (for lack of better therm). :-/
As for people talking about things ... society allways have those, on both sides of every topic or problem ... but we were talking here about individuals, not societies.

(Just a little offtopic to think about:
When you take under concideration things people concidered to be "perfectly normal" 20/50/100y ago ... did you ever wondered how incredibly discuisting and savage we will seem to peple after next few generations?

)