I don't get the arguments for bioessentialism

[Bagpuss]

The examples the OP gives are not a problem. Bioessentialism becomes problematic when two things happen:

1. The essentialism is about being "the bad guy" such that it's ok to kill them on sight (evil Drow, evil Orcs, etc).
2. The way that evilness is portrayed is by using tropes that have historically been used as an excuse to exterminate and enslave other people.

I agree esspecially about it being "problematic", ie just something that is difficult to handle, not something that has to necessarily be avoided completely.