They suck. They do not protect all identities. And if you want to apply those laws, you most often have to go through a legal process or courts which claim to be objective but actually are heavily favoring the oppressors. Those laws can also be changed / removed any time by the current goverment.

They suck so much, even in their best possible implementation anarchists would not find them ideal.

That said, till we actually build the power to protect ourselves and our communities from oppression & discrimination, we probably will have to use them when we feel they will help us survive.