The discrimination thing is kind of bullshit. A just-so story. It's really not that hard to avoid liability on that.

Even so, lot of companies are deficient in explaining to their employees that certain kinds of discrimination are illegal, coz it still happens plenty - almost always during interviews. Remarks about pregnancy do happen.

It is more work to provide feedback (which I think is mainly what people hate) but it's better for your hiring reputation, provided the feedback isnt routinely nonsensical - in which case staying quiet probably is better.