It's hard work, but not a burden. People have kids because they like having them. Keeping with the Ferrari analogy, cleaning your Ferrari is also hard work, but nobody would pity you for the "burden" or having to clean your Ferrari.

Not sure if you are aware, but if you don't like them anymore, there are ways to get rid of them. You could send them to a boarding school (or at least to a school where they have to stay at school all day), hire a nanny, or give them up for adoption, for example. If your parents are still alive, you could ask them to take over, too.

As for feminism, the whole discussion only exists because of feminism. Therefore, yes, it is about feminism.